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RIght - Seams in duct boot elbow are fully sealed with mastic.

RIght - Seams in duct boot elbow are fully sealed with mastic.
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Right - Straps are spaced close enough together to provide adequate support of the flex duct

Right - Straps are spaced close enough together to provide adequate support of the flex duct
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Right - The butterfly damper of this crawlspace supply register opens when the HVAC fan is running; the damper duct is sealed with mastic and supported by strapping.

Right - The butterfly damper of this crawlspace supply register opens when the HVAC fan is running; the damper duct is sealed with mastic and supported by strapping.
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Right - The duct shows redundant sealing including the caulk, tape, and flashing

Right - The duct shows redundant sealing including the caulk, tape, and flashing
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Right - The HVAC ducts are located between floors in conditioned space.

Right - The HVAC ducts are located between floors in conditioned space.
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Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.

Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.
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Right - The kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding; however, the opening should be screened to keep out pests.

Right - The kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding; however, the opening should be screened to keep out pests.
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Right - The open web floor joists have ample space for HVAC ducts

Right - The open web floor joists have ample space for HVAC ducts
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Right - The precast insulated concrete walls of the basement provide a conditioned space for the high-efficiency (18 SEER, 9.5 HSPF) air-source heat pump, with its variable-speed fan, five-stage compressor, and MERV 11 filter.

Right - The precast insulated concrete walls of the basement provide a conditioned space for the high-efficiency (18 SEER, 9.5 HSPF) air-source heat pump, with its variable-speed fan, five-stage compressor, and MERV 11 filter.
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Right - The rigid metal HVAC ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss.

Right - The rigid metal HVAC ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss.
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Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.

Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.
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Right - This duct penetration is properly flashed and integrated with the taped, foil-faced foam sheathing layer, which serves as the air and water barrier

Right - This duct penetration is properly flashed and integrated with the taped, foil-faced foam sheathing layer, which serves as the air and water barrier
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Right - This heat pump is located in a closet inside the home and all ducts are located within conditioned space between floors.

Right - This heat pump is located in a closet inside the home and all ducts are located within conditioned space between floors.
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Right - This kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding.

Right - This kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding.
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Right – a booster fan was installed in this long dryer duct to increase air flow and help prevent the duct from being clogged with lint

Right – a booster fan was installed in this long dryer duct to increase air flow and help prevent the duct from being clogged with lint
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Right – A contractor installs mastic in branch duct take offs to air seal the seams where they attach to the trunk duct.

Right – A contractor installs mastic in branch duct take offs to air seal the seams where they attach to the trunk duct.
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Right – A dimpled-plastic rain mat was attached to the exterior below-ground walls to help minimize frost damage in cold climates.

Right – A dimpled-plastic rain mat was attached to the exterior below-ground walls to help minimize frost damage in cold climates.
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Right – A separately ducted HRV supplies fresh air to most rooms in the home.

Right – A separately ducted HRV supplies fresh air to most rooms in the home.
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Right – All supply ducts in this home were located in conditioned space; any return ducts that were located in the attic were insulated with closed-cell spray foam and buried in the blown-in attic insulation to prevent air leakage and heat loss.

Right – All supply ducts in this home were located in conditioned space; any return ducts that were located in the attic were insulated with closed-cell spray foam and buried in the blown-in attic insulation to prevent air leakage and heat loss.
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Right – Batt insulation provides additional insulation for the home’s main duct chase.

Right – Batt insulation provides additional insulation for the home’s main duct chase.
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Right – Because this home is in a coastal location that may flood the crawlspace is vented and the home is constructed on metal piers.

Right – Because this home is in a coastal location that may flood the crawlspace is vented and the home is constructed on metal piers.
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Right – Chase capped with rigid air barrier and duct work penetrations properly sealed

Right – Chase capped with rigid air barrier and duct work penetrations properly sealed
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Right – Duct register is mastic sealed to framing

Right – Duct register is mastic sealed to framing
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Right – Ducts are pulled taut and correctly supported.

Right – Ducts are pulled taut and correctly supported.