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Right – Flex duct is mastic sealed at junction box

Right – Flex duct is mastic sealed at junction box
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Right – Flex duct is properly connected to metal duct with a duct tie and connection is mastic sealed

Right – Flex duct is properly connected to metal duct with a duct tie and connection is mastic sealed
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Right – Flex duct is used to connect the duct tester to the largest part of the ductwork where the ducts meet the ERV Cabinet; this helps ensure uniform pressure distribution during a duct leakage test

Right – Flex duct is used to connect the duct tester to the largest part of the ductwork where the ducts meet the ERV Cabinet; this helps ensure uniform pressure distribution during a duct leakage test
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Right – Flex duct register is mastic sealed to framing

Right – Flex duct register is mastic sealed to framing
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Right – Flex ducts are properly supported with straps that don’t pinch the insulation; closed-cell spray foam will be applied to the underside of the roof deck of this hot-humid climate home to provide an insulated attic space for the HVAC ducts.

Right – Flex ducts are properly supported with straps that don’t pinch the insulation; closed-cell spray foam will be applied to the underside of the roof deck of this hot-humid climate home to provide an insulated attic space for the HVAC ducts.
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Right – Holes were drilled into the I joists between floors to run the small-diameter HRV ducts.

Right – Holes were drilled into the I joists between floors to run the small-diameter HRV ducts.
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Right – HVAC furnace filter is properly installed in cabinet with gasketed cover to prevent air leakage

Right – HVAC furnace filter is properly installed in cabinet with gasketed cover to prevent air leakage
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Right – Metal duct boot is properly sealed at seams

Right – Metal duct boot is properly sealed at seams
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Right – Metal is mechanically fastened at junction

Right – Metal is mechanically fastened at junction
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Right – Metal or fiberboard duct is mastic sealed at junction with duct register box

Right – Metal or fiberboard duct is mastic sealed at junction with duct register box
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Right – Metal or fiberboard duct is mastic sealed at seams

Right – Metal or fiberboard duct is mastic sealed at seams
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Right – Neatly cut and sealed penetration

Right – Neatly cut and sealed penetration
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Right – Open web floor joists can provide a space between floors for HVAC ducting.

Right – Open web floor joists can provide a space between floors for HVAC ducting.
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Right – Penetrations have been neatly cut and properly sealed with foam

Right – Penetrations have been neatly cut and properly sealed with foam
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Right – Plastic tenting increases the height of the insulation above ducts that are located in the attic.

Right – Plastic tenting increases the height of the insulation above ducts that are located in the attic.
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Right – R-25 of open-cell spray foam lines this new home’s attic ceiling, to protect HVAC ducts from heat and cold.

Right – R-25 of open-cell spray foam lines this new home’s attic ceiling, to protect HVAC ducts from heat and cold.
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Right – Rigid foam is installed behind HVAC ducts to provide additional insulation to the ducts which are installed within the conditioned space.

Right – Rigid foam is installed behind HVAC ducts to provide additional insulation to the ducts which are installed within the conditioned space.
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Right – The hard metal ducts are located in conditioned space between floor joists and all seams are sealed with approved metal tape.

Right – The hard metal ducts are located in conditioned space between floor joists and all seams are sealed with approved metal tape.
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Right – The mechanical damper leading to interior ductwork from a Central ERV is wide open for a duct leakage test when the duct tester is attached to an exterior door of the ERV Cabinet

Right – The mechanical damper leading to interior ductwork from a Central ERV is wide open for a duct leakage test when the duct tester is attached to an exterior door of the ERV Cabinet
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Right – The round metal ducts are sealed with mastic at all joints.

Right – The round metal ducts are sealed with mastic at all joints.
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Right – The termination of this kitchen exhaust duct is sealed to the wall to keep out air and water and is screened to keep out pests.

Right – The termination of this kitchen exhaust duct is sealed to the wall to keep out air and water and is screened to keep out pests.
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Right – These duct take-offs are well sealed to the branch duct

Right – These duct take-offs are well sealed to the branch duct
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Right – This ductwork is well-sealed for the ducts connecting a large rooftop ERV with central ductwork

Right – This ductwork is well-sealed for the ducts connecting a large rooftop ERV with central ductwork
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Right – This home uses a small-diameter high-velocity duct system with a main duct (plenum) that is one-fourth the size of a conventional duct and branch ducts with a 2- or 2.5-inch inside diameter.

Right – This home uses a small-diameter high-velocity duct system with a main duct (plenum) that is one-fourth the size of a conventional duct and branch ducts with a 2- or 2.5-inch inside diameter.