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This bath fan is ducted through the roof but the ducting is so excessively long that air flow is likely to be very poor

This bath fan is ducted through the roof but the ducting is so excessively long that air flow is likely to be very poor
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This bathroom exhaust fan includes a fan and light

This bathroom exhaust fan includes a fan and light
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This ceiling fixture has linear LEDs

This ceiling fixture has linear LEDs
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This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow

This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow This Central Fan Integrated Supply (CFIS) duct is undersized and kinked, limiting required airflow
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This constant airflow regulator (CAR) has been fouled by aerosolized sealant because it was not covered while the ducts were being sealed with the aerosolized acrylic sealant.

This constant airflow regulator (CAR) has been fouled by aerosolized sealant because it was not covered while the ducts were being sealed with the aerosolized acrylic sealant.
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This constant airflow regulator (CAR) has been fouled by deposition of aerosolized sealant because it was not protected during duct sealing

This constant airflow regulator (CAR) has been fouled by deposition of aerosolized sealant because it was not protected during duct sealing
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This dropped soffit runs the length of the house providing a convenient place to locate one trunk duct with several very short side ducts that supply heat and cooling to most rooms of the house.

This dropped soffit runs the length of the house providing a convenient place to locate one trunk duct with several very short side ducts that supply heat and cooling to most rooms of the house.
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This duct became disconnected from the trunk duct because the duct take-off was poorly installed.

This duct became disconnected from the trunk duct because the duct take-off was poorly installed.
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This duct board seam failure is due to the failed tape adhesive.

This duct board seam failure is due to the failed tape adhesive.
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This duct take-off collar had become loose so the sheet metal tabs are being re-bent to make the collar more secure.

This duct take-off collar had become loose so the sheet metal tabs are being re-bent to make the collar more secure.
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This ducted mini-split heat pump was installed in the unvented, conditioned attic and ducted with short duct runs to several nearby rooms.

This ducted mini-split heat pump was installed in the unvented, conditioned attic and ducted with short duct runs to several nearby rooms.
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This exhaust fan duct is not properly attached to the roof vent so most of the moist bathroom exhaust air will vent into the attic instead of out through the roof

This exhaust fan duct is not properly attached to the roof vent so most of the moist bathroom exhaust air will vent into the attic instead of out through the roof
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This exhaust fan duct is problematic for several reasons: it ends in the attic without being vented through the roof, it uses corrugated plastic pipe instead of metal pipe, and it is not well supported with a sharp bend that restricts air flow

This exhaust fan duct is problematic for several reasons: it ends in the attic without being vented through the roof, it uses corrugated plastic pipe instead of metal pipe, and it is not well supported with a sharp bend that restricts air flow
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This exhaust fan duct is properly insulated and is properly vented through the roof

This exhaust fan duct is properly insulated and is properly vented through the roof
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This exhaust fan duct opens into the attic rather than exiting through the roof and mold has begun to form on the underside of the deck sheathing and on the rafter due to the moist air exiting the duct

This exhaust fan duct opens into the attic rather than exiting through the roof and mold has begun to form on the underside of the deck sheathing and on the rafter due to the moist air exiting the duct
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This flex duct is much longer than it needs to be; the extra loops greatly decrease air flow in the duct.

This flex duct is much longer than it needs to be; the extra loops greatly decrease air flow in the duct.
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This Habitat for Humanity builder ordered roof trusses with a 2-foot by 2-foot notch next to the center post then lined the cutout with rigid foam to form an insulated central duct chase to bring the heating and cooling ducts within the conditioned space.

This Habitat for Humanity builder ordered roof trusses with a 2-foot by 2-foot notch next to the center post then lined the cutout with rigid foam to form an insulated central duct chase to bring the heating and cooling ducts within the conditioned space.
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This home’s ultra-efficient ground-source heat pump provides hot water for space heating as well as domestic hot water for the 50-gallon storage tank.

This home’s ultra-efficient ground-source heat pump provides hot water for space heating as well as domestic hot water for the 50-gallon storage tank.
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This house was designed with half of the basement above grade, allowing 36-inch-tall windows for egress and daylight on both sides of the house.

This house was designed with half of the basement above grade, allowing 36-inch-tall windows for egress and daylight on both sides of the house.
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This IR camera image shows a recessed can light that is well sealed and insulated.

This IR camera image shows a recessed can light that is well sealed and insulated.
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This is a take-off collar for connecting a round metal duct to a flat sheet metal trunk duct.

This is a take-off collar for connecting a round metal duct to a flat sheet metal trunk duct.
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This is an example of an insulation pattern for rigid metal ducts that has been measured and cut in a comfortable location before being carried into the attic.

This is an example of an insulation pattern for rigid metal ducts that has been measured and cut in a comfortable location before being carried into the attic.
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This louvered vent cap works well for clothes dryer vent ducts because it has no screening that could trap dryer lint

This louvered vent cap works well for clothes dryer vent ducts because it has no screening that could trap dryer lint
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This manual dimmer switch controls the lighting output of multiple fixtures to save energy.

This manual dimmer switch controls the lighting output of multiple fixtures to save energy.