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Combined space and water heating system with tankless gas water heater

Combined space and water heating system with tankless gas water heater
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Combustion safety testing using a smoke pen

Combustion safety testing using a smoke pen
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Common exhaust duct not shared by fans in separate dwellings

Common exhaust duct not shared by fans in separate dwellings
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Compact duct design layout

Compact duct design layout
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Compact duct layout example

Compact duct layout example
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Condensing boilers have primary and secondary heat exchangers

Condensing boilers have primary and secondary heat exchangers
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Conducting a Residential Duct Leakage Test and Blower Door Test: Duct blaster testing – Hooking up the duct blaster to the return register

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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

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

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

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Conduction is heat transferred by contact, like the hot pan that fries an egg or the hot asphalt that burns bare feet.

Conduction is heat transferred by contact, like the hot pan that fries an egg or the hot asphalt that burns bare feet.
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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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Convection is heat transferred via air or liquid movement in a pattern of cooling/falling and warming/rising like hot water that rises and falls in a percolating coffee pot.

Convection is heat transferred via air or liquid movement in a pattern of cooling/falling and warming/rising like hot water that rises and falls in a percolating coffee pot.
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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
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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 two pieces of sheet metal to fit around the flue

Cut two pieces of sheet metal to fit around the flue
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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