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The duct for this exhaust fan is properly routed through the roof and the duct is insulated

The duct for this exhaust fan is properly routed through the roof and the duct is insulated
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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 enhanced comfort attic insulation consists of an ultra-efficient 25-inch-thick layer of blown cellulose providing a substantial R-90 insulation value.

The enhanced comfort attic insulation consists of an ultra-efficient 25-inch-thick layer of blown cellulose providing a substantial R-90 insulation value.
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The exhaust ducts use gable end vent- the foil duct exits the vent but likely does not have a proper terminating vent with grill; the corrugated plastic vent does not go outside. Smooth metal ducts, rather than corrugated, provide best air flow

The exhaust ducts use gable end vent- the foil duct exits the vent but likely does not have a proper terminating vent with grill; the corrugated plastic vent does not go outside. Smooth metal ducts, rather than corrugated, provide best air flow
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The floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing

The floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing
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The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.

The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.
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The gaps around this duct boot are sealed with canned spray foam.

The gaps around this duct boot are sealed with canned spray foam.
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The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.

The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.
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The green framing is lumber that was pressure treated with borate to increase its resistance to termites, mold, and moisture

The green framing is lumber that was pressure treated with borate to increase its resistance to termites, mold, and moisture
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The grille in the photo on the left brings air into a return air plenum under an air handler platform. As shown in the infrared image on the right, the plenum is not air sealed so hot attic air is being pulled into the air handler closet.

The grille in the photo on the left brings air into a return air plenum under an air handler platform. As shown in the infrared image on the right, the plenum is not air sealed so hot attic air is being pulled into the air handler closet.
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The grooves and ridges within flexible ducts can collect dust and dirt

The grooves and ridges within flexible ducts can collect dust and dirt
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The heat pump water heater’s evaporator fan provides enough air movement for active ventilation of a small room when the exhaust is ducted; intake air enters passively through a wall grille

The heat pump water heater’s evaporator fan provides enough air movement for active ventilation of a small room when the exhaust is ducted; intake air enters passively through a wall grille
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The high-efficiency air-to-air heat pump is set in an overflow pan with an emergency shut off sensor in case the condensate tube were to clog and cause condensate to fill up the pan.

The high-efficiency air-to-air heat pump is set in an overflow pan with an emergency shut off sensor in case the condensate tube were to clog and cause condensate to fill up the pan.
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The hole in the air handler box, on left, was covered with a piece of 30-gauge sheet metal that was cut to size and sealed in place with screws and mastic.

The hole in the air handler box, on left, was covered with a piece of 30-gauge sheet metal that was cut to size and sealed in place with screws and mastic.
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The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.
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The HVAC ducts are properly supported with wide straps spaced close together.

The HVAC ducts are properly supported with wide straps spaced close together.
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The inner liner of the flex duct is fastened to the collar with a tension tie, the connection is sealed with mastic, then the outer layer is pulled over and sealed with mastic or foil tape (Steven Winter Associates 2013).

The inner liner of the flex duct is fastened to the collar with a tension tie, the connection is sealed with mastic, then the outer layer is pulled over and sealed with mastic or foil tape (Steven Winter Associates 2013).
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The joints in the ducts and air handler are sealed with mastic.

The joints in the ducts and air handler are sealed with mastic.
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The jump duct should be insulated and sealed at registers

The jump duct should be insulated and sealed at registers
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The large hole that was cut in the subfloor penetration for this HVAC duct has been air-sealed using sheet metal, mastic, and metal tape.

The large hole that was cut in the subfloor penetration for this HVAC duct has been air-sealed using sheet metal, mastic, and metal tape.