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The back-draft damper on this exhaust fan is closed to prevent cross contamination

The back-draft damper on this exhaust fan is closed to prevent cross contamination
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The back-draft damper on this exhaust fan is open when the exhaust fan is operating

The back-draft damper on this exhaust fan is open when the exhaust fan is operating
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The back-draft damper open when the fan is actively exhausting and closes when the fan is off

The back-draft damper open when the fan is actively exhausting and closes when the fan is off
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The basement is half in and half out of the ground with only 4 feet below grade, which allows for full 36-inch-tall windows that are completely above grade.

The basement is half in and half out of the ground with only 4 feet below grade, which allows for full 36-inch-tall windows that are completely above grade.
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The blower wheel (fan) on this ductless wall-mounted indoor unit has accumulated dust and mold - a common issue for this design.

The blower wheel (fan) on this ductless wall-mounted indoor unit has accumulated dust and mold - a common issue for this design.
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The condensate line (amber-colored plastic tube) from the high-efficiency furnace drains into the sewer via the same drain pipe as the clothes washer

The condensate line (amber-colored plastic tube) from the high-efficiency furnace drains into the sewer via the same drain pipe as the clothes washer
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The condensate line on this air conditioner has been covered with pipe insulation.

The condensate line on this air conditioner has been covered with pipe insulation (.
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The dark streaks seen in this infrared camera image of a return vent in a ceiling indicate cooler air is leaking in around the vent.

The dark streaks seen in this infrared camera image of a return vent in a ceiling indicate cooler air is leaking in around the vent.
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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution

The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the return side of the air handler for conditioning, mixing, and distribution
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The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the supply side of the central air handler for mixing and distribution

The dehumidifier draws air from a common area in the house, dehumidifies it, and adds it to the supply side of the central air handler for mixing and distribution
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The dehumidifier draws air from both a common area in the house and from outside, dehumidifies it, and adds it to the supply side of the air handler for distribution

The dehumidifier draws air from both a common area in the house and from outside, dehumidifies it, and adds it to the supply side of the air handler for distribution
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The drain pans sit below the cooling coil to catch condensate and direct it to a drain line

The drain pans sit below the cooling coil to catch condensate and direct it to a drain line
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The drain pipe should include a trap and a clean-out with a removable cap

The drain pipe should include a trap and a clean-out with a removable cap
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The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier

The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier
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The duct sealing spray injection system application tunnel inflates as the injection system operates

The duct sealing spray injection system application tunnel inflates as the injection system operates
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The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)

The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)
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The duct tester and blower door are set up to measure leakage to the outdoors

The duct tester and blower door are set up to measure leakage to the outdoors
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The duct tester is set up to depressurize the duct system.

The duct tester is set up to depressurize the duct system.
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The ducts are located in conditioned space in open-web joists between the floors and supported to prevent sagging.

The ducts are located in conditioned space in open-web joists between the floors and supported to prevent sagging.
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The edge of this 1-inch HVAC filter indicates it's dimensions, allowing proper matching of filter to air handler

The edge of this 1-inch HVAC filter indicates it's dimensions, allowing proper matching of filter to air handler
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The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan

The ENERGY STAR logo on the manufacturer’s label indicates this is an ENERGY STAR qualifying exhaust fan
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The exposed riser shown here also supplies the radiator. A short pipe runs under the floor to the hand valve.

The exposed riser shown here also supplies the radiator. A short pipe runs under the floor to the hand valve.
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The fan does have an ENERGY STAR label

The fan does have an ENERGY STAR label
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The fan does not have an ENERGY STAR label

The fan does not have an ENERGY STAR label