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Image:

Condensing boilers have primary and secondary heat exchangers

Condensing boilers have primary and secondary heat exchangers
Video:

Conducting a Residential Duct Leakage Test and Blower Door Test: Duct blaster testing – Hooking up the duct blaster to the return register

Video:

Conducting a Residential Duct Leakage Test and Blower Door Test: Quick and easy set up of the blower door and determination of whole house air leakage

Video:

Conducting a Residential Duct Leakage Test and Blower Door Test: Sequencing - Run the blower door test first

Video:

Conducting a Residential Duct Leakage Test: Why set the Duct Fan to Depressurize not Pressurize the Home

Image:

Connect the plastic application tunnel from the injection equipment to the supply plenum.

Connect the plastic application tunnel from the injection equipment to the supply plenum.
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Connect the plastic application tunnel to the injection equipment

Connect the plastic application tunnel to the injection equipment
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Connection in place but not sealed

Connection in place but not sealed
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Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions

Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
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Cool air flow is produced when the cooling cycle is energized (set thermostat to “cool”)

Cool air flow is produced when the cooling cycle is energized (set thermostat to “cool”)
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Cooling air temperatures that can be achieved by a direct evaporative cooler at various outdoor conditions

Cooling air temperatures that can be achieved by a direct evaporative cooler at various outdoor conditions
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Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct

Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
Image:

Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections

Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections
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Cut the duct to the length needed

Cut the duct to the length needed
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Cut-away view showing unsealed gaps around a heating duct that goes through a wall

Cut-away view showing unsealed gaps around a heating duct that goes through a wall
Presentation:

Design Options for Locating Ducts within Conditioned Space

Design Options for Locating Ducts within Conditioned Space
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Desuperheater for domestic hot water

Desuperheater for domestic hot water
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Diagram of buried ducts

Diagram of buried ducts
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Direct vent appliance installed

Direct vent appliance installed
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Direct-heat risers are bare pipes that heat the space they're in without connected radiators

Direct-heat risers are bare pipes that heat the space they're in without connected radiators
Case Study:

DOE ZERH HIA 2014 Case Study: Imery Group Proud Green Home, Serenbe, GA

Case Study:

DOE ZERH HIA 2014 Case Study: M Street Homes, Smartlux on Greenpark Houston, TX

Case Study:

DOE ZERH HIA 2014 Case Study: Southeast Volusia Habitat for Humanity, Edgewater, FL

Case Study:

DOE ZERH HIA 2017 Case Study: United Way of Long Island, United Veterans Beacon House, Huntington Station, NY