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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 fan has noticeable gaps between the fan box and the drywall that will need to be sealed with spray foam or caulk

This fan has noticeable gaps between the fan box and the drywall that will need to be sealed with spray foam or caulk
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This fan was inserted into a cleanly cut hole in the ceiling so there is only a very narrow gap around the edges of the fan box that needs to be caulked or taped

This fan was inserted into a cleanly cut hole in the ceiling so there is only a very narrow gap around the edges of the fan box that needs to be caulked or taped
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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 exhibits signs that it has backdrafted in the past, including soot marks on the sheet metal outside of the burner tubes.

This furnace exhibits signs that it has backdrafted in the past, including soot marks on the sheet metal outside of the burner tubes.
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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 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 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 installation manual shows the model number of the replacement disposable filters for an exhaust fan

This installation manual shows the model number of the replacement disposable filters for an exhaust fan
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This is an ambient atmospheric-combustion furnace that pulls its combustion air from the room or space in which it is located in through an open grill on the front of the combustion chamber.

This is an ambient atmospheric-combustion furnace that pulls its combustion air from the room or space in which it is located in through an open grill on the front of the combustion chamber.
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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 multi-split heat pump system incorporates several indoor units connected to just one outdoor unit; the indoor units include a wall-mounted unit, floor-mounted, ceiling cassette, and mini-air handler.

This multi-split heat pump system incorporates several indoor units connected to just one outdoor unit; the indoor units include a wall-mounted unit, floor-mounted, ceiling cassette, and mini-air handler.
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This narrow bottle brush was an effective tool for removing the debris between the blades of this bathroom exhaust fan

This narrow bottle brush was an effective tool for removing the debris between the blades of this bathroom exhaust fan
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This pipe insulation for air conditioner and heat pump refrigerant lines comes with an integrated UV-resistant vapor barrier layer for protection against the sun and harsh weather.

This pipe insulation for air conditioner and heat pump refrigerant lines comes with an integrated UV-resistant vapor barrier layer for protection against the sun and harsh weather.
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This plan view of a multifamily building shows how a leaky central exhaust system can create negative pressure zones, pulling unconditioned outside air or humid inside air into the service shaft and wall cavities

This plan view of a multifamily building shows how a leaky central exhaust system can create negative pressure zones, pulling unconditioned outside air or humid inside air into the service shaft and wall cavities
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This plot shows a heat pump’s minimum and maximum cooling capacities overlaid with a home’s cooling load line, allowing a designer to assess how well-suited the equipment is for the specific home.

This plot shows a heat pump’s minimum and maximum cooling capacities overlaid with a home’s cooling load line, allowing a designer to assess how well-suited the equipment is for the specific home.
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This plot shows a heat pump’s minimum and maximum heating capacities overlaid with a home’s heating load line as well as the annual heating load hours for the home, allowing a designer to assess how well-suited the equipment is for the specific home.

This plot shows a heat pump’s minimum and maximum heating capacities overlaid with a home’s heating load line as well as the annual heating load hours for the home, allowing a designer to assess how well-suited the equipment is for the specific home.
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This plot shows a heat pump’s minimum and maximum heating capacities overlaid with a home’s heating load line, allowing a designer to assess how well-suited the equipment is for the specific home.

This plot shows a heat pump’s minimum and maximum heating capacities overlaid with a home’s heating load line, allowing a designer to assess how well-suited the equipment is for the specific home.