This language is defined as a communication protocol. One of the most widely used communication protocols in the industry is BACnet, which stands for Building Automation and Control Network. The rules governing the BACnet communication protocol are defined in ANSI/ASHRAE Standard 135-2020, “BACnet: A Data Communication Protocol for Building Automation and Control Network.”\u003c/p>\u003cp >BACnet defines a series of (hardware) device profiles, as follows: \u003c/p>\u003col >\u003cli >BACnet advanced operator workstation software (B-AWS); \u003c/li>\u003cli >Remote BACnet advanced operator workstation software (Remote B-AWS); \u003c/li>\u003cli >Portable operator workstation software (Portable B-OWS); \u003c/li>\u003cli >Building controllers (B-BC);\u003c/li>\u003cli >Advanced application controllers (B-AAC);\u003c/li>\u003cli >Application specific controllers (B-ASC);\u003c/li>\u003cli >Smart sensor (SS); and \u003c/li>\u003cli >Smart actuator (SA). \u003c/li>\u003c/ol>\u003cp >\u003cbr />The B-BCs and B-AACs are typically used to control cooling and heating plants and large pieces of HVAC equipment, such as air-handling units (AHUs), that have a significant number of sensors, actuators, and relatively sophisticated sequences of operations. B-ASCs are typically used to control VAV boxes, fan coil units, fan-powered boxes, and other terminal equipment characterized by a limited number of control points.\u003c/p>\u003cp >The architecture of the BAS describes how the hardware components are arranged in the building. To understand this wiring road map, one must first comprehend the various BACnet communication protocols. The two most widely used BACnet communication protocols currently employed are BACnet IP and BACnet MS/TP.\u003c/p>\u003cp >The "IP" in the BACnet IP communication protocol stands for internet protocol. This means the devices that use this type of communication protocol are wired through Ethernet cables. The communication wiring (not to be confused with the wiring for power to the devices) is like the wiring used to network standard routers with PCs or laptops in a home or office environment.\u003c/p>\u003cp >Devices that use the BACnet MS/TP communication protocol are wired via RS-485 twisted-pair serial cabling daisy-chained (a wiring scheme in which multiple devices are wired together in sequence or in a ring that communicate signals through each device in a binary manner) into one network or multiple subnetworks, depending on the quantity of devices. The daisy chain can be seen on the FCU B-ASC in Figure 2. The "MS" in MS/TP stands for master/slave, while the "TP" stands for token passing. For the control devices to communicate using the MS/TP protocol, devices must take turns (passing a token) becoming a master, while other devices become slaves. \u003c/p>\u003cp >It's extremely important to note the communication speed between devices communicating over the BACnet IP protocol can support 100-MB-plus internet speeds, whereas the communication speed between devices communicating over BACnet MS/TP protocol typically has about 0.1 MB speed, at maximum. As the number of hardware components being controlled by a BAS increases, this speed differential may have a noticeable impact on the system response for critical processes. BAS speed is often an area where costs vary widely, and the benefits of improvements in performance need to be weighed by the owner.\u003c/p>\u003cp >Having determined the communication protocol, one must next understand the different types of potential network approaches that can be used to wire the hardware components of the BAS to define the system architecture. An ELCN typically consists of high-speed BACnet/IP local area networks (LAN) to host B-AWSs, B-BCs, BLCNs, and web-enabled remote connectivity. A BLCN shall consist of a BACnet internetwork to host field-level DDC controllers.\u003c/p>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"epyINyAILXR","type":"section","children":["e-RDU0-hPjs"],"cl":"section"},{"key":"e0JiyscSTuR","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}},"desktop":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}},"mobile":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"ezF5UEeqbSO","content":{"src":{"url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png","key":"qSeiv-ji1T","ratio":1.8175257731958763}},"type":"image","actions":["e0JiyscSTuR"],"cl":"image"},{"key":"eTBfAuftfw9","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"e6OeatoKYMi","type":"rectangle","actions":["eTBfAuftfw9"],"cl":"rectangle"},{"key":"eqFUoYJQgDD","content":{"text":"\u003cp >\u003cstrong >FIGURE 2: A sample BAS architecture using BACnet MS/TP and BACnet IP protocols.\u003c/strong>\u003c/p>"},"type":"text","cl":"text"},{"key":"e6Pxfjl_7Jb","type":"section","children":["ezF5UEeqbSO","e6OeatoKYMi","eqFUoYJQgDD"],"cl":"section"},{"key":"e2hdBPCx00s","content":{"text":"\u003cp >A potential BACnet-based network architecture is shown in Figure 2. Typically, a B-BC is provided to control the main AHU serving the floor. B-ASCs are then provided to control all VAV boxes associated with that AHU. B-SSs and B-SAs can also be connected to the same MS/TP network used by the VAV boxes. \u003c/p>\u003cp >Lighting control systems are typically integrated into a BACnet-based BAS using BACnet gateways. The gateway acts as translators between the controllers within the lighting controls system and the BACnet-based BAS. This is required because, in most instances, lighting control systems use a proprietary (vendor specific) communication protocol (and not BACnet IP or MS/TP). The gateways are needed to translate the language of BACnet into the (proprietary) language used by the lighting control systems. \u003c/p>\u003cp >It's important to note the terms "gateway" and "routers" are not interchangeable. As previously described, gateways are translators that are used to join dissimilar systems. On the other hand, and as shown in Figure 2, routers are facilitators of communication. If devices use the same communication protocol (e.g., BACnet), the router forwards messages between the devices on the network. Lastly, a network switch is used to connect multiple devices and networks to expand the LAN.\u003c/p>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"ewQLxfzvCP3","type":"section","children":["e2hdBPCx00s"],"cl":"section"},{"key":"e0m9mqRdOT2","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}},"desktop":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}},"mobile":{"params":{"trigger":"Load","updated":1637072881410,"LoadAnimation":{"duration":0.9,"delay":0.4,"once":true,"translateX":["10%","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutExpo"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eoObpxcCn2z","content":{"src":{"url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png","key":"cbxrUHeDrA","ratio":1.7862137862137861}},"type":"image","actions":["e0m9mqRdOT2"],"cl":"image"},{"key":"eDE2YyRza4f","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1612214680286,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":false,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eHF_rSEqxlk","type":"rectangle","actions":["eDE2YyRza4f"],"cl":"rectangle"},{"key":"eGC6mh7mbpy","content":{"text":"\u003cp >\u003cstrong >FIGURE 3. A sample BAS architecture using only the BACnet IP protocol.\u003c/strong>\u003c/p>"},"type":"text","cl":"text"},{"key":"eTmNQtxaBde","type":"section","children":["eoObpxcCn2z","eHF_rSEqxlk","eGC6mh7mbpy"],"cl":"section"},{"key":"eKp78p-Llnb","content":{"text":"\u003cp >The current industry trend, supported by some of the largest vendors in the controls industry, is for B-ASCs to come with the capability of being directly connected to the BACnet IP network. This eliminates the need for BACnet MS/TP communication protocol and the associated wiring. As shown in Figure 3, the B-ASCs can be wired in at least three configurations, with each architecture having its own pros and cons. \u003c/p>\u003cp >In the first configuration (BACnet IP: Subnet 1), the B-ASCs are daisy-chained together and through the associated AHU B-BC. The advantage to this approach is that the amount of Ethernet cable needed to connect all devices on the subnet is relatively short. One of the main risks associated with this approach is loss of communication; that's if the cable between any two devices is damaged and/or if one device has lost power, then the BAS will most likely lose communication with the devices located downstream of the device that has lost power. \u003c/p>\u003cp >To mitigate the risk of losing communication with as few devices as possible, another potential configuration is to divide the network into subnetworks; the devices on each subnetwork (BACnet IP: subnet 2) will then be daisy chained together and connected to the rest of the network(s) via switches. One of the cons of using this configuration is the need for additional Ethernet cable and the associated labor hours required for installation. \u003c/p>\u003cp >Relative to the first and second configuration, a more conservative third approach is to “home run” each device. This means an ethernet cable is run between the device and a central location (typically an IT room) that houses a series of switches. Although this approach minimizes the risk of losing communication with the devices, it is the most expensive method of designing and installing a BAS and requires the most physical space for cabling and switching.\u003c/p>\u003cp >The intent behind this article is to provide a foundation from which young engineers and contractors may begin to understand the terminology, components, and system architectures that are commonly used in the industry. When developing a BAS, it is within both the engineers’ and owners’ best interest to conduct a cost/benefit/risk analysis that can be vetted before proceeding with the design to establish a type of network architecture that best meets the needs of the building and the owners’ budget. Moreover, it would also be beneficial to incorporate the construction manager into the BAS conversation. This practice allows for expectations to be set early on the project regarding the BAS and the components necessary to deliver on the project requirements. With the engineer providing a breakdown of the BAS and the construction manager voicing his or her concerns or confirmations of the BAS design constructability and cost impact, the owner’s ability to interpret and act on the data becomes an important determinant in the design process.\u003c/p>\u003cp >Look for additional articles from SmithGroup on the topic of BAS architecture in the months to come. These will dive deeper into specific BAS components, protocols, and architectures, and how to implement them into a cohesive design.\u003c/p>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"ecJdLgvu0eW","type":"section","children":["eKp78p-Llnb"],"cl":"section"},{"key":"eVvEKa1RQI0","content":{"src":{"key":"tuNX2qmslc","url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/tuNX2qmslc.png","ratio":0.7996422182468694}},"type":"image","cl":"image"},{"key":"e04ZHCaSEd9","content":{"text":"\u003ch4 >\u003cstrong >Khaled Khalil\u003cbr>\u003c/strong>Khaled Khalil is a mechanical designer with SmithGroup in Washington, D.C. He recently joined SmithGroup after graduating from the Pennsylvania State University with a master’s degree in architectural engineering with a mechanical focus. He is gaining experience across a variety of project work and is particularly drawn to the unique process of control system development. He can be contacted at \u003ca target=\"_self\" rel=\"noopener external\" href=\"khaled.khalil@smithgroup.com\" >khaled.khalil@smithgroup.com\u003c/a>.\u003c/h4>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"eJS1sy3gHbL","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eVe_ll1gYNH","type":"section","actions":["eJS1sy3gHbL"],"children":["eVvEKa1RQI0","e04ZHCaSEd9"],"cl":"section"},{"key":"eO4MjBEqQMj","content":{"src":{"url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/ckvy5vzGxw.jpg","key":"ckvy5vzGxw","ratio":1}},"type":"image","cl":"image"},{"key":"e5LGKxWtl2p","content":{"text":"\u003ch4 >\u003cstrong >Jamison Caldwell, P.E., LEED AP\u003cbr>\u003c/strong>Jamison Caldwell is mechanical engineering Principal with SmithGroup in Washington, D.C. He has more than 15 years of mechanical design experience. While primarily focused on science and technology projects within the higher education studio, Jamison also has experience in mission critical, healthcare and campus planning. He holds a bachelor’s degree in Mechanical Engineering from Lafayette College. He can be contacted at \u003ca target=\"_self\" rel=\"noopener external\" href=\"Jamison.caldwell@smithgroup.com\" >Jamison.caldwell@smithgroup.com\u003c/a>.\u003c/h4>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"e8ltaaiDcaX","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eSZwxuKA8te","type":"section","actions":["e8ltaaiDcaX"],"children":["eO4MjBEqQMj","e5LGKxWtl2p"],"cl":"section"},{"key":"eyfU_4_8GDM","content":{"text":"\u003ch4>\u003cstrong>Ionel Petrus, P.E., CEM, LEED AP BD+C\u003cbr/>\u003c/strong>Ionel Petrus is a licensed professional engineer who has more than 13 years of mechanical design experience. In addition to being the mechanical discipline leader in SmithGroup’s Washington, D.C., office, he is also a LEED AP and a certified energy manager. His experience includes designing HVAC systems for commercial buildings, research laboratories, health care facilities, and museums. He can be contacted at \u003ca href=\"mailto:ionel.petrus@smithgroup.com?Subject=ES%20-%20Magazine\" target=\"_blank\">ionel.petrus@smithgroup.com.\u003c/a>\u003c/h4>"},"type":"text","cl":"text p-_Js1xJSc"},{"key":"e8n54yHS2yx","content":{"src":{"url":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/8ZltYynHt_.jpg","key":"8ZltYynHt_","ratio":1.0218181818181817}},"type":"image","cl":"image"},{"key":"eIo9lD2Tps-","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1657206618963,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":true,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1657206618963,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":true,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1657206618963,"LoadAnimation":{"duration":0.6,"delay":0.7,"once":true,"translateX":["-30px","0"],"preset":"slideInLeft","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"ekQrZeNDTZz","content":{"text":"\u003cp >\u003cem >Video by Dimitris Christou from \u003c/em>\u003ca target=\"_blank\" rel=\"noopener external\" href=\"https://pixabay.com/videos/glow-city-urban-building-cityscape-22276/\" >\u003cem >Pixabay\u003c/em>\u003c/a>\u003c/p>"},"type":"text","actions":["eIo9lD2Tps-"],"cl":"text p-_Js1xJSc"},{"key":"e158zNa-pEn","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"desktop":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}},"mobile":{"params":{"trigger":"Load","updated":1608217389567,"LoadAnimation":{"duration":1,"delay":0.3,"once":true,"translateY":["6%","0"],"preset":"slide","opacity":[0,1],"easing":"easeOutQuart"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eTabw3VZjC_","type":"section","actions":["e158zNa-pEn"],"children":["eyfU_4_8GDM","e8n54yHS2yx","ekQrZeNDTZz"],"cl":"section"},{"key":"eXw1UWcELwy","content":{"link":{"mode":0,"page":"pKEO3CF_5i-"}},"type":"external-link","cl":"external-link"},{"key":"e9xo-TdzOO8","content":{"text":"\u003cdiv>\u003cp >Table Of Contents\u003c/p>\u003c/div>"},"type":"text","actions":["eXw1UWcELwy"],"cl":"text"},{"key":"eXyKQJ_Afue","content":{"text":"\u003cp >December 2022\u003c/p>"},"type":"text","cl":"text"},{"key":"epvMA1WloWF","content":{"link":{"mode":0,"page":"pQ_tSND9zxs"}},"type":"external-link","cl":"external-link"},{"key":"eymJqTmYeU4","content":{"src":"4fH1Di577"},"type":"image","actions":["epvMA1WloWF"],"cl":"image"},{"key":"evJwmGJEreu","type":"section","children":["e9xo-TdzOO8","eXyKQJ_Afue","eymJqTmYeU4"],"cl":"section"},{"key":"p-RPF7MLf78","children":["eDQDuwNUMl_","eBtZK9FrYJ_","eZuejHOwnhG","et6VJiqT3-w","eBDyWiWFTZ6","eQvukYzbtp_","epyINyAILXR","e6Pxfjl_7Jb","ewQLxfzvCP3","eTmNQtxaBde","ecJdLgvu0eW","eVe_ll1gYNH","eSZwxuKA8te","eTabw3VZjC_","evJwmGJEreu"]},{"key":"eAb3-GroHoj","content":{"menu":"WEb_epwzVM"},"type":"w7Ty9ifjBD","icons":{"left":[192,512,"M192 127.338v257.324c0 17.818-21.543 26.741-34.142 14.142L29.196 270.142c-7.81-7.81-7.81-20.474 0-28.284l128.662-128.662c12.599-12.6 34.142-3.676 34.142 14.142z"],"right":[192,512,"M0 384.662V127.338c0-17.818 21.543-26.741 34.142-14.142l128.662 128.662c7.81 7.81 7.81 20.474 0 28.284L34.142 398.804C21.543 411.404 0 402.48 0 384.662z"]},"cl":"w7Ty9ifjBD"},{"key":"eRgA_lSpqfx","content":{"time":0.5},"type":"wdu2rjhi","cl":"wdu2rjhi"},{"key":"eDnkgmGFdd1","content":{"cont":{"tablet":{"params":{"HoverAnimation":{"duration":0.5,"delay":0,"background":{"a":0.17,"b":245,"r":224,"g":239},"preset":"bgColor","event":"bot","easing":"easeOutQuart"},"trigger":"Load","updated":1605886820624,"LoadAnimation":{"duration":0.9,"delay":3,"preset":"fadeIn","opacity":[0,1],"easing":"easeOutQuad"}}},"desktop":{"params":{"HoverAnimation":{"duration":0.5,"delay":0,"background":{"a":0.17,"r":224,"b":245,"g":239},"preset":"bgColor","event":"bot","easing":"easeOutQuart"},"trigger":"Load","updated":1605886820624,"LoadAnimation":{"duration":0.9,"delay":3,"preset":"fadeIn","opacity":[0,1],"easing":"easeOutQuad"}}},"mobile":{"params":{"HoverAnimation":{"duration":0.5,"delay":0,"background":{"a":0.17,"r":224,"b":245,"g":239},"preset":"bgColor","event":"bot","easing":"easeOutQuart"},"trigger":"Load","updated":1605886820624,"LoadAnimation":{"duration":0.9,"delay":3,"preset":"fadeIn","opacity":[0,1],"easing":"easeOutQuad"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"e0IkELhoaN-","content":{"shapeId":"sp4g88JfB"},"type":"shape","actions":["eRgA_lSpqfx","eDnkgmGFdd1"],"cl":"shape"},{"key":"eaprDDsOtLk","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1626382220593,"LoadAnimation":{"duration":0.3,"delay":2,"preset":"fadeIn","opacity":[0,1],"easing":"easeOutQuad"}}},"desktop":{"params":{"trigger":"Load","updated":1626382220593,"LoadAnimation":{"duration":0.3,"delay":2,"preset":"fadeIn","opacity":[0,1],"easing":"easeOutQuad"}}},"mobile":{"params":{"trigger":"Load","updated":1626382220593,"LoadAnimation":{"duration":0.3,"delay":2,"preset":"fadeIn","opacity":[0,1],"easing":"easeOutQuad"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eZeXC-wwvds","content":{"linkUrl":"","adCreative":null,"ioDetailID":null,"adSize":"Cover Sponsor","showElement":{"image":{"type":2,"value":{"bucket":"cdn.vev.design","path":"private/pK53XiUzGnRFw1uPeFta7gdedx22/5NMtHY-S4k_Rotation-256.png.png","name":"Rotation-256.png","url":"https://cdn.vev.design/private/pK53XiUzGnRFw1uPeFta7gdedx22/5NMtHY-S4k_Rotation-256.png.png"}},"name":"sponsored by BOX","page":"pQ_tSND9zxs","pageName":"Cover","key":"e8W3avyxO5M"},"advertiserName":""},"type":"whFspJafhvC","actions":["eaprDDsOtLk"],"icons":{"close":[448,512,"M400 32H48C21.5 32 0 53.5 0 80v352c0 26.5 21.5 48 48 48h352c26.5 0 48-21.5 48-48V80c0-26.5-21.5-48-48-48zm-54.4 289.1c4.7 4.7 4.7 12.3 0 17L306 377.6c-4.7 4.7-12.3 4.7-17 0L224 312l-65.1 65.6c-4.7 4.7-12.3 4.7-17 0L102.4 338c-4.7-4.7-4.7-12.3 0-17l65.6-65-65.6-65.1c-4.7-4.7-4.7-12.3 0-17l39.6-39.6c4.7-4.7 12.3-4.7 17 0l65 65.7 65.1-65.6c4.7-4.7 12.3-4.7 17 0l39.6 39.6c4.7 4.7 4.7 12.3 0 17L280 256l65.6 65.1z"]},"cl":"whFspJafhvC"},{"key":"e9izUwqkWdv","content":{"cont":{"tablet":{"params":{"HoverAnimation":{"duration":0.2,"delay":0,"scale":1.1,"preset":"scaleUp","easing":"easeInOutQuad"},"trigger":"Hover","updated":1657211010804}},"desktop":{"params":{"HoverAnimation":{"duration":0.2,"delay":0,"scale":1.1,"preset":"scaleUp","easing":"easeInOutQuad"},"trigger":"Hover","updated":1657211010804}},"mobile":{"params":{"HoverAnimation":{"duration":0.2,"delay":0,"scale":1.1,"preset":"scaleUp","easing":"easeInOutQuad"},"trigger":"Hover","updated":1657211010804}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eYld9f2tyN_","content":{"pageMenu":"WEb_epwzVM"},"type":"w1br1l0lsu-u06","actions":["e9izUwqkWdv"],"icons":{"menu":[448,512,"M442 114H6a6 6 0 0 1-6-6V84a6 6 0 0 1 6-6h436a6 6 0 0 1 6 6v24a6 6 0 0 1-6 6zm0 160H6a6 6 0 0 1-6-6v-24a6 6 0 0 1 6-6h436a6 6 0 0 1 6 6v24a6 6 0 0 1-6 6zm0 160H6a6 6 0 0 1-6-6v-24a6 6 0 0 1 6-6h436a6 6 0 0 1 6 6v24a6 6 0 0 1-6 6z"]},"cl":"w1br1l0lsu-u06"},{"key":"e2bR-OkKZQ_","content":{"cont":{"tablet":{"params":{"trigger":"Load","updated":1657220664857,"LoadAnimation":{"duration":0.5,"delay":0,"loop":true,"scale":1.2,"preset":"pulsate","easing":"easeInOutQuad"}}},"desktop":{"params":{"trigger":"Load","updated":1657220664857,"LoadAnimation":{"duration":0.5,"delay":0,"loop":true,"scale":1.2,"preset":"pulsate","easing":"easeInOutQuad"}}},"mobile":{"params":{"trigger":"Load","updated":1657220664857,"LoadAnimation":{"duration":0.5,"delay":0,"loop":true,"scale":1.2,"preset":"pulsate","easing":"easeInOutQuad"}}}}},"type":"w75y8u1c","cl":"w75y8u1c"},{"key":"eskKUjiifKv","content":{"link":{"mode":0,"page":"puYDnSmJNxu"},"pageMenu":"WEb_epwzVM"},"type":"external-link","cl":"external-link"},{"key":"eG63I4pKkCc","content":{"shapeId":"Ie6XS5TUx"},"type":"shape","actions":["e2bR-OkKZQ_","eskKUjiifKv"],"cl":"shape"},{"key":"fixed","visibility":{"eZeXC-wwvds":{"pQ_tSND9zxs":true},"eYld9f2tyN_":true,"eG63I4pKkCc":{"pQ_tSND9zxs":true},"e9dYTVXAV5A":true,"eMQH6J-08nL":true,"eNSazsVkBKt":true,"eAb3-GroHoj":{"p-6YJVNWa-6":true,"pAwx3GtZNlO":true,"prREYLPYiWl":true,"pHx3KU0Ot6C":true,"peqGMdL12_E":true,"pPFa_YvniI3":true,"poypSPbN2Cj":true,"pYGmV08-XPI":true,"pvjuS82Ozcp":true,"px76AfowM3l":true,"pzc65mJ-hxV":true,"pHmQhk58oWp":true,"pQV8MJzzfpG":true,"pbBhnGlOQzh":true,"pgbpLRL_rkI":true,"pCOHfOe2AxB":true,"pTpMf0iDPbT":true,"ppv4Rp9phW0":true,"pTpHDtIbuDq":true,"pKLy3e00lzH":true,"pIqVbnAJIkB":true,"p4HMTblCoam":true,"peJ99HFlWS-":true,"pS1GMPgHl8E":true,"phDwC-d1t-f":true,"p59qsupr7uy":true,"p-RPF7MLf78":true,"pcE-0EhU6Xi":true,"pm1225a3r7i":true,"pKEO3CF_5i-":true,"p-8VC492Bu6":true,"puYDnSmJNxu":true,"pMMKRacvacP":true,"pEIKezLqFsI":true,"p5G4wFz0B6A":true,"pIOBeLGK0tA":true,"pFYDdRWSxZd":true,"pnBS-FBPvEN":true},"eJUil1NyZnM":true,"eUV7T8TgoTf":true},"children":["eAb3-GroHoj","e0IkELhoaN-","eZeXC-wwvds","eYld9f2tyN_","eG63I4pKkCc"]}],"pages":[{"key":"p-6YJVNWa-6","title":"Editor's Note","desc":"A few industry observations that could help your firm’s accumulate the paper that matters most: money.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/2m-gq3758u.jpg","path":"editors-note"},{"key":"p-8VC492Bu6","title":"Building Health: A Physician’s View","desc":"Turning down the thermostat will do more than make the payer of the energy bill happy. ","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/gPgUOxzt4K.jpg","path":"building-health-a-physicians-view"},{"key":"p-RPF7MLf78","title":"Caldwell Feature","desc":"Considering the myriad of options available, where does one start in the process of designing and/or installing a building automation system?","cover":"undefined/image/social/undefined/p-RPF7MLf78/v/0.jpg","path":"caldwell-feature"},{"key":"p4HMTblCoam","title":"Industry News","desc":"Industry news for facility, consulting, and mechanical engineers delivering energy-efficient solutions for high-performance buildings.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/3j2S-AfEoF.jpg","path":"industry-news"},{"key":"p59qsupr7uy","title":"Tomorrow's Environment","desc":"The best-case scenario is not college or trade school, it’s actually incorporating both.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/DJFd8VvrEX.jpg","path":"tomorrows-environment"},{"key":"p5G4wFz0B6A","title":"ad- Rheem","cover":"undefined/image/social/undefined/p5G4wFz0B6A/v/0.jpg","path":"ad--rheem"},{"key":"pAwx3GtZNlO","title":"ad- Lochinvar","cover":"undefined/image/social/undefined/pAwx3GtZNlO/v/0.jpg","path":"ad--lochinvar"},{"key":"pCOHfOe2AxB","title":"ad- Taco","cover":"undefined/image/social/undefined/pCOHfOe2AxB/v/0.jpg","path":"ad--taco"},{"key":"pEIKezLqFsI","title":"Varley Feature","desc":"When systematically applied to design, elegance fosters engineering excellence.","cover":"undefined/image/social/undefined/pEIKezLqFsI/v/0.jpg","path":"varley-feature"},{"key":"pFYDdRWSxZd","title":"ad- Lync-2","cover":"undefined/image/social/undefined/pFYDdRWSxZd/v/0.jpg","path":"ad--lync-2"},{"key":"pHmQhk58oWp","title":"ad- Mitsubishi-WEBINAR","cover":"undefined/image/social/undefined/pHmQhk58oWp/v/0.jpg","path":"ad--mitsubishi-webinar"},{"key":"pHx3KU0Ot6C","title":"Cover Story","cover":"undefined/image/social/undefined/pHx3KU0Ot6C/v/0.jpg","path":"cover-story"},{"key":"pIOBeLGK0tA","title":"Security & Resiliency","desc":"","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qNRIXBUtIc.jpg","path":"security--resiliency"},{"key":"pIqVbnAJIkB","title":"On the Internet","desc":"A wealth of information and multimedia presentations are available on our website, www.esmagazine.com. Here is a sampling of some of our most recent offerings. ","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/b4msp2pc-r.jpg","path":"on-the-internet"},{"key":"pKEO3CF_5i-","title":"Table of Contents","desc":"The articles and columns included in this month's issue.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/2g177L1n2R.jpg","path":"table-of-contents"},{"key":"pKLy3e00lzH","title":"Commissioning","desc":"After 25 years, this will be my final contribution to Engineered Systems’ Commissioning column.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/BJTOJO3wyw.jpg","path":"commissioning"},{"key":"pMMKRacvacP","title":"Building Automation","desc":"Repetitive tasks become mundane quickly, so here's some free software that can make our lives a bit simpler.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/G0Sj8L3LEe.jpg","path":"building-automation"},{"key":"pPFa_YvniI3","title":"Masthead","desc":"A behind-the-scenes look at the brains responsible for every issue of Engineered Systems magazine. ","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/tfabe4DksX.jpg","path":"masthead"},{"key":"pQV8MJzzfpG","title":"ad-Classifieds","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/Iik-d9hltl.jpg","path":"ad-classifieds"},{"key":"pQ_tSND9zxs","title":"Cover","desc":"The cover of the December 2022 issue of Engineered Systems magazine. ","cover":"undefined/image/social/undefined/pQ_tSND9zxs/v/0.jpg","path":"","index":true},{"key":"pS1GMPgHl8E","title":"ad- Lync1","cover":"undefined/image/social/undefined/pS1GMPgHl8E/v/0.jpg","path":"ad--lync1"},{"key":"pTpHDtIbuDq","title":"ad- ES HOUSE-BOOKSTORE","cover":"undefined/image/social/undefined/pTpHDtIbuDq/v/0.jpg","path":"ad--es-house-bookstore"},{"key":"pTpMf0iDPbT","title":"Hahne Feature","desc":"Passive radiant cooling and heating system designs exploit the properties of all heat transfer modalities for enhanced system efficiency and healthier built environments. ","cover":"undefined/image/social/undefined/pTpMf0iDPbT/v/0.jpg","path":"hahne-feature"},{"key":"pYGmV08-XPI","title":"Products In Focus","desc":"A page of recently released HVACR products that should be on engineers' radars. ","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/po_78l_y2a.jpg","path":"products-in-focus"},{"key":"pbBhnGlOQzh","title":"Case In Point","desc":"BIM allows for upfront coordination among all trades to predetermine conflict and clash resolution before boots ever hit the ground. ","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/i1ai-4vFKy.jpg","path":"case-in-point"},{"key":"pcE-0EhU6Xi","title":"ad-Sourcebook TSI Inc.","cover":"undefined/image/social/undefined/pcE-0EhU6Xi/v/0.jpg","path":"ad-sourcebook-tsi-inc"},{"key":"peJ99HFlWS-","title":"Al Attar Feature","desc":"Providing sustainable indoor environments is a social responsibility that should not be mutually exclusive with proprietary profit margins.","cover":"undefined/image/social/undefined/peJ99HFlWS-/v/0.jpg","path":"al-attar-feature"},{"key":"peqGMdL12_E","title":"ad-Sourcebook Premium Sponsorships","desc":"","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/zEgXeieXqR.jpg","path":"ad-sourcebook-premium-sponsorships"},{"key":"pgbpLRL_rkI","title":"ad-Sourcebook Thermo-Cycler Industries Inc.","cover":"undefined/image/social/undefined/pgbpLRL_rkI/v/0.jpg","path":"ad-sourcebook-thermo-cycler-industries-inc"},{"key":"phDwC-d1t-f","title":"ad-Sourcebook Belimo Aircontrols (USA), Inc.","cover":"undefined/image/social/undefined/phDwC-d1t-f/v/0.jpg","path":"ad-sourcebook-belimo-aircontrols-usa-inc"},{"key":"pm1225a3r7i","title":"ad- ES HOUSE-EDUCATION","cover":"undefined/image/social/undefined/pm1225a3r7i/v/0.jpg","path":"ad--es-house-education"},{"key":"pnBS-FBPvEN","title":"Ad Index","desc":"The manufacturers who support the production of this month's issue of Engineered Systems magazine.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/R__5idLCPl.jpg","path":"ad-index"},{"key":"poypSPbN2Cj","title":"ad-Sourcebook MSA Safety","cover":"undefined/image/social/undefined/poypSPbN2Cj/v/0.jpg","path":"ad-sourcebook-msa-safety"},{"key":"ppv4Rp9phW0","title":"From The Factory Floor","desc":"Data center free-cooling system components, such as air-to-water heat exchangers, are subject to the possibility of corrosion, which can lead to significant efficiency and availability issues.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/nDp0WkHoBt.jpg","path":"from-the-factory-floor"},{"key":"prREYLPYiWl","title":"eMagazine Navigation Guide","desc":"","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/id3FTJ6FHm.jpg","path":"emagazine-navigation-guide"},{"key":"puYDnSmJNxu","title":"ad- high impact - Rheem","cover":"undefined/image/social/undefined/puYDnSmJNxu/v/0.jpg","path":"ad--high-impact---rheem"},{"key":"pvjuS82Ozcp","title":"Back 2 Basics","desc":"Howard McKew's long-running, popular column and quiz.","cover":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=628,w=1200,fit=crop/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/RVuStmGdqU.jpg","path":"back-2-basics"},{"key":"px76AfowM3l","title":"ad- ES HOUSE-SOURCEBOOK","cover":"undefined/image/social/undefined/px76AfowM3l/v/0.jpg","path":"ad--es-house-sourcebook"},{"key":"pzc65mJ-hxV","title":"ad- ES HOUSE-LEARN & EARN","cover":"undefined/image/social/undefined/pzc65mJ-hxV/v/0.jpg","path":"ad--es-house-learn--earn"}],"shapes":{"Ie6XS5TUx":[192,512,"M0 384.662V127.338c0-17.818 21.543-26.741 34.142-14.142l128.662 128.662c7.81 7.81 7.81 20.474 0 28.284L34.142 398.804C21.543 411.404 0 402.48 0 384.662z"],"YZubdGyIV":[256,512,"M119.5 262.9L3.5 145.1c-4.7-4.7-4.7-12.3 0-17l7.1-7.1c4.7-4.7 12.3-4.7 17 0L128 223.3l100.4-102.2c4.7-4.7 12.3-4.7 17 0l7.1 7.1c4.7 4.7 4.7 12.3 0 17L136.5 263c-4.7 4.6-12.3 4.6-17-.1zm17 128l116-117.8c4.7-4.7 4.7-12.3 0-17l-7.1-7.1c-4.7-4.7-12.3-4.7-17 0L128 351.3 27.6 249.1c-4.7-4.7-12.3-4.7-17 0l-7.1 7.1c-4.7 4.7-4.7 12.3 0 17l116 117.8c4.7 4.6 12.3 4.6 17-.1z"],"_x17N1u_Fj":[256,512,"M119.5 262.9L3.5 145.1c-4.7-4.7-4.7-12.3 0-17l7.1-7.1c4.7-4.7 12.3-4.7 17 0L128 223.3l100.4-102.2c4.7-4.7 12.3-4.7 17 0l7.1 7.1c4.7 4.7 4.7 12.3 0 17L136.5 263c-4.7 4.6-12.3 4.6-17-.1zm17 128l116-117.8c4.7-4.7 4.7-12.3 0-17l-7.1-7.1c-4.7-4.7-12.3-4.7-17 0L128 351.3 27.6 249.1c-4.7-4.7-12.3-4.7-17 0l-7.1 7.1c-4.7 4.7-4.7 12.3 0 17l116 117.8c4.7 4.6 12.3 4.6 17-.1z"],"sp4g88JfB":[256,512,"M136.5 249.1l116 117.8c4.7 4.7 4.7 12.3 0 17l-7.1 7.1c-4.7 4.7-12.3 4.7-17 0L128 288.7 27.6 390.9c-4.7 4.7-12.3 4.7-17 0l-7.1-7.1c-4.7-4.7-4.7-12.3 0-17l116-117.8c4.7-4.6 12.3-4.6 17 .1zm-17-128L3.5 238.9c-4.7 4.7-4.7 12.3 0 17l7.1 7.1c4.7 4.7 12.3 4.7 17 0L128 160.7l100.4 102.2c4.7 4.7 12.3 4.7 17 0l7.1-7.1c4.7-4.7 4.7-12.3 0-17L136.5 121c-4.7-4.6-12.3-4.6-17 .1z"]},"images":{"4fH1Di577":{"meta":{"description":"Text, Font"},"src":"https://cdn.vev.design/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/images/4fH1Di577/2100.png","srcset":[["https://cdn.vev.design/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/images/4fH1Di577/500.png",500],["https://cdn.vev.design/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/images/4fH1Di577/2100.png",1080],["https://cdn.vev.design/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/images/4fH1Di577/2100.png",1600],["https://cdn.vev.design/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/images/4fH1Di577/2100.png",2100]]},"8ZltYynHt_":{"meta":{"width":562,"description":"Forehead, Shirt, Sleeve, Collar","height":550},"src":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/8ZltYynHt_.jpg","srcset":[["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=320/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/8ZltYynHt_.jpg",320],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/8ZltYynHt_.jpg",562]]},"cbxrUHeDrA":{"meta":{"width":1788,"height":1001,"description":"Rectangle"},"src":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png","srcset":[["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=320/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png",320],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=640/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png",640],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=960/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png",960],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=1280/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png",1280],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/cbxrUHeDrA.png",1788]]},"ckvy5vzGxw":{"meta":{"width":195,"height":195,"description":"Forehead, Nose, Smile, Chin, Hairstyle, Eyebrow, Jaw, Coat, Beard"},"src":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/ckvy5vzGxw.jpg","srcset":[["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/ckvy5vzGxw.jpg",195]]},"kGFrGv6m5y":{"meta":{"width":1575,"height":933,"description":"Rectangle"},"src":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/kGFrGv6m5y.png","srcset":[["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=320/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/kGFrGv6m5y.png",320],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=640/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/kGFrGv6m5y.png",640],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=960/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/kGFrGv6m5y.png",960],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=1280/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/kGFrGv6m5y.png",1280],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/kGFrGv6m5y.png",1575]]},"qSeiv-ji1T":{"meta":{"width":1763,"height":970,"description":"Rectangle, Slope, Line, Font"},"src":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png","srcset":[["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=320/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png",320],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=640/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png",640],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=960/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png",960],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,w=1280/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png",1280],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/qSeiv-ji1T.png",1763]]},"tuNX2qmslc":{"meta":{"width":447,"height":559,"description":"Dress shirt, Forehead, Eyebrow, Eye, Tie, Coat, Jaw, Neck, Sleeve"},"src":"https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/tuNX2qmslc.png","srcset":[["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82,h=320/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/tuNX2qmslc.png",320],["https://cdn.vev.design/cdn-cgi/image/f=auto,q=82/private/KaxzywoIf0Rx41JdO6oEbX8EsUI3/image/tuNX2qmslc.png",559]]}},"pkg":{"text":"basic","section":"basic","rectangle":"basic","frame":"basic","image":"basic","w75y8u1c":"basic","shape":"basic","external-link":"basic","w1bn5r0s80-1477":"p8vPJJ1MbCI","circle":"basic","whFspJafhvC":"enfxfhXZ-6","w1br1l0lsu-u06":"pgxSSDpDPRe","w7Ty9ifjBD":"pEIMfUpQ6oy","w74dqar7":"basic","wdu2rjhi":"pWZZK88Bj0M"},"menus":{"WEb_epwzVM":{"title":"pdf","children":[{"link":{"mode":0,"page":"pQ_tSND9zxs"},"title":"Cover","key":"7Mk3ppTZyw"},{"link":{"mode":0,"page":"puYDnSmJNxu"},"title":"ad- high impact - Rheem","key":"9MRInWFUxB"},{"link":{"mode":0,"page":"pKEO3CF_5i-"},"title":"Table of Contents","key":"wsSOOSCE6P"},{"link":{"mode":0,"page":"pFYDdRWSxZd"},"title":"ad-Lync-2","key":"R1So4D0Xqi"},{"link":{"mode":0,"page":"pnBS-FBPvEN"},"title":"Ad Index","key":"YcEa-52h-x"},{"link":{"mode":0,"page":"pAwx3GtZNlO"},"title":"ad- Lochinvar","key":"d6mVbDyIlj"},{"link":{"mode":0,"page":"p-6YJVNWa-6"},"title":"Editor's Note","key":"JRK8Vo0rej"},{"link":{"mode":0,"page":"pCOHfOe2AxB"},"title":"ad- Taco","key":"S4AtSofV_x"},{"link":{"mode":0,"page":"p4HMTblCoam"},"title":"Industry News","key":"x4lFLPH4XR"},{"link":{"mode":0,"page":"pIqVbnAJIkB"},"title":"On the Internet","key":"Ssz1l9FT_W"},{"link":{"mode":0,"page":"pvjuS82Ozcp"},"title":"Back 2 Basics","key":"tT9kXEIa9S"},{"link":{"mode":0,"page":"pbBhnGlOQzh"},"title":"Case In Point","key":"fNCTqHUzSg"},{"link":{"mode":0,"page":"pHmQhk58oWp"},"title":"ad- Mitsubishi-WEBINAR","key":"D5XMUmM2fR"},{"link":{"mode":0,"page":"pKLy3e00lzH"},"title":"Commissioning","key":"wKY6uEi9zJ"},{"link":{"mode":0,"page":"p5G4wFz0B6A"},"title":"ad-Rheem","key":"Kd2x6BSaDc"},{"link":{"mode":0,"page":"p-8VC492Bu6"},"title":"Building Health: A Physician’s View","key":"_iR6XlYQm7"},{"link":{"mode":0,"page":"pS1GMPgHl8E"},"title":"ad- Lync1","key":"u1cIXERqbQ"},{"link":{"mode":0,"page":"pMMKRacvacP"},"title":"Building Automation","key":"kE5EHAjYTe"},{"link":{"mode":0,"page":"pEIKezLqFsI"},"title":"Varley Feature","key":"g5JcBVOrAE"},{"link":{"mode":0,"page":"pTpHDtIbuDq"},"title":"ad- ES HOUSE-BOOKSTORE","key":"H2Fvus64B3"},{"link":{"mode":0,"page":"p-RPF7MLf78"},"title":"Caldwell Feature","key":"yqbLRlgtgw"},{"link":{"mode":0,"page":"pm1225a3r7i"},"title":"ad- ES HOUSE-EDUCATION","key":"1JvDKRRGyC"},{"link":{"mode":0,"page":"pTpMf0iDPbT"},"title":"Hahne Feature","key":"pYVQjRVSAw"},{"link":{"mode":0,"page":"pzc65mJ-hxV"},"title":"ad- ES HOUSE-LEARN & EARN","key":"OEtCwKAqTJ"},{"link":{"mode":0,"page":"peJ99HFlWS-"},"title":"Al Attar Feature","key":"Ux9gJG74Cu"},{"link":{"mode":0,"page":"px76AfowM3l"},"title":"ad- ES HOUSE-SOURCEBOOK","key":"0tvte9_Gru"},{"link":{"mode":0,"page":"ppv4Rp9phW0"},"title":"From The Factory Floor","key":"qEzK2ORiBG"},{"link":{"mode":0,"page":"pQV8MJzzfpG"},"title":"ad-Classifieds","key":"nQvKzsvRvT"},{"link":{"mode":0,"page":"pYGmV08-XPI"},"title":"Products In Focus","key":"cM7p3j5AZB"},{"link":{"mode":0,"page":"p59qsupr7uy"},"title":"Tomorrow's Environment","key":"WUEBoQbMDp"},{"link":{"mode":0,"page":"peqGMdL12_E"},"title":"ad-Sourcebook Premium Sponsorships","key":"HU3BmaSOlq"},{"link":{"mode":0,"page":"pPFa_YvniI3"},"title":"Masthead","key":"A60Pww9na1"}],"key":"WEb_epwzVM"},"e6Sb-N9KZH":{"title":"Main menu","children":[{"children":[{"link":{"mode":0,"page":"pEIKezLqFsI"},"title":"Varley Feature","key":"u0QK3hT4kz"},{"link":{"mode":1,"widget":{"image":{"type":2,"value":{"bucket":"cdn.vev.design","path":"private/dk3UctceTPWKJtA1g8n4EFqTvuo2/sMCfp44b_view_array-24px.svg.svg","name":"view_array-24px.svg","url":"https://cdn.vev.design/private/dk3UctceTPWKJtA1g8n4EFqTvuo2/sMCfp44b_view_array-24px.svg.svg"}},"name":"Features TOP","page":"pKEO3CF_5i-","pageName":"Table of Contents","key":"eDJhapb6E-_"}},"title":"Features","key":"XzaveSJGfz"},{"link":{"mode":1,"widget":{"image":{"type":2,"value":{"bucket":"cdn.vev.design","path":"private/dk3UctceTPWKJtA1g8n4EFqTvuo2/sMCfp44b_view_array-24px.svg.svg","name":"view_array-24px.svg","url":"https://cdn.vev.design/private/dk3UctceTPWKJtA1g8n4EFqTvuo2/sMCfp44b_view_array-24px.svg.svg"}},"name":"Columns","page":"pKEO3CF_5i-","pageName":"Table of Contents","key":"eteLM03ZPah"}},"title":"Columns","key":"3FgM03AXu_"},{"link":{"mode":1,"widget":{"image":{"type":2,"value":{"bucket":"cdn.vev.design","path":"private/dk3UctceTPWKJtA1g8n4EFqTvuo2/sMCfp44b_view_array-24px.svg.svg","name":"view_array-24px.svg","url":"https://cdn.vev.design/private/dk3UctceTPWKJtA1g8n4EFqTvuo2/sMCfp44b_view_array-24px.svg.svg"}},"name":"depart","page":"pKEO3CF_5i-","pageName":"Table of Contents","key":"eno0rApboVJ"}},"title":"Departments","key":"lgt10O5Jic"}],"link":{"mode":0,"page":"pKEO3CF_5i-"},"title":"Table of Contents","key":"Dy41E102Er"},{"children":[{"link":{"mode":0,"page":"prREYLPYiWl"},"title":"Navigation","key":"bJadQV9odV"},{"link":{"mode":2,"href":"https://www.esmagazine.com/publications/3","target":true},"title":"Archives","key":"q45z95LzE1"},{"link":{"mode":0,"page":"pPFa_YvniI3"},"title":"Masthead","key":"VsLBYvTyUS"},{"link":{"mode":2,"href":"https://www.dropbox.com/s/4wn9utooe8iyuvv/ES-December-2022.pdf?dl=0"},"title":"Download","key":"GJUclbipLB"},{"link":{"mode":2,"href":"https://www.esmagazine.com/"},"title":"esmagazine.com","key":"UnhnqgI4hc"}],"link":{"mode":2},"title":"Help","key":"olgBl92hs8"}],"key":"e6Sb-N9KZH"}},"primaryMenu":"WEb_epwzVM","settings":{"devices":[{"mode":"desktop","minMax":true,"columnWidth":[1024,1024],"canvasSize":[1440,900]},{"mode":"tablet","minMax":true,"columnWidth":[600,600],"canvasSize":[768,1024]},{"mode":"mobile","minMax":true,"columnWidth":[320,320],"canvasSize":[375,667]}]},"masterMode":"desktop"}