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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 exterior vent has a louvered flap that opens when the bathroom exhaust fan is running and air is being exhausted outside

This exterior vent has a louvered flap that opens when the bathroom exhaust fan is running and air is being exhausted outside
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This exterior vent has a louvered flap that should close fully when the exhaust fan is turned off

This exterior vent has a louvered flap that should close fully when the exhaust fan is turned off
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This exterior vent has a single flap that opens when the bathroom exhaust fan is running and air is being exhausted outside

This exterior vent has a single flap that opens when the bathroom exhaust fan is running and air is being exhausted outside
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This flowchart describes which ACCA manuals are needed in each phase of the HVAC design process.

This flowchart describes which ACCA manuals are needed in each phase of the HVAC design process.
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This fresh air intake filter box provides for access to a replaceable filter for air intake duct with a 6-inch collar.

This fresh air intake filter box provides for access to a replaceable filter for air intake duct with a 6-inch collar.
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This furnace filter has become very clogged with dust and needs to be replaced.

This furnace filter has become very clogged with dust and needs to be replaced.
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This heat pump compressor unit is elevated to avoid ground moisture and flooding, but water dripping from the roof above froze on the unit in winter, encasing it in ice.

This heat pump compressor unit is elevated to avoid ground moisture and flooding, but water dripping from the roof above froze on the unit in winter, encasing it in ice.
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This home’s balanced fresh air system includes a filtered fresh air intake that is wired to the central HVAC system with timer controls while exhaust fans in the kitchen, bathrooms, and laundry room pull stale and moist air from the home.

This home’s balanced fresh air system includes a filtered fresh air intake that is wired to the central HVAC system with timer controls while exhaust fans in the kitchen, bathrooms, and laundry room pull stale and moist air from the home.
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This home’s domestic hot water is provided by three systems: solar water heating panels, a heat pump water heater, and an air-to-water heat pump, which also provides hot water to a fan coil.

This home’s domestic hot water is provided by three systems: solar water heating panels, a heat pump water heater, and an air-to-water heat pump, which also provides hot water to a fan coil.
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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 hood covers an exhaust vent for a bath fan exterior vent; this hood is improperly installed and the top does not lap under the siding so water can easily get behind it

This hood covers an exhaust vent for a bath fan exterior vent; this hood is improperly installed and the top does not lap under the siding so water can easily get behind it
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This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home

This HRV, installed in a conditioned attic, provides balanced ventilation to the whole home
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This HVAC air filter slot contains a 1-inch-thick filter but the slot is designed to accept either a 1-inch or a 4-inch air filter.

This HVAC air filter slot contains a 1-inch-thick filter but the slot is designed to accept either a 1-inch or a 4-inch air filter.
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This HVAC air filter slot is covered with a door that is held in place with spring clips and tabs.

This HVAC air filter slot is covered with a door that is held in place with spring clips and tabs.
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This HVAC awning is made of metal roofing that is attached directly to the lumber framing.

This HVAC awning is made of metal roofing that is attached directly to the lumber framing.
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This IR camera image shows an HVAC duct in the attic that may have displaced insulation.

This IR camera image shows an HVAC duct in the attic that may have displaced insulation.
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This is the ceiling vent for a basic bathroom exhaust fan

This is the ceiling vent for a basic bathroom exhaust fan
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This is the compact outside unit for an ultra-efficient air-to-water heat pump (COP 4.1) that provides space heating and domestic hot water.

This is the compact outside unit for an ultra-efficient air-to-water heat pump (COP 4.1) that provides space heating and domestic hot water.
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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 microwave oven is located over the stove and has an exhaust fan underneath it

This microwave oven is located over the stove and has an exhaust fan underneath it
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This MSHP operates with 120 volts power, has an EER of 18 Btu/Wh, uses about 800 W at full output, and operates remotely with a smart home control system

This MSHP operates with 120 volts power, has an EER of 18 Btu/Wh, uses about 800 W at full output, and operates remotely with a smart home control system