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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 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 return inlet has been covered and sealed in preparation for a duct leakage test at rough-in.

This return inlet has been covered and sealed in preparation for a duct leakage test at rough-in.
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This rigid duct connection was repaired using self-piercing/self-drilling sheet metal screws to mechanically secure the connection; then it was air sealed using UL-181 fiber-reinforced duct sealant mastic paste

This rigid duct connection was repaired using self-piercing/self-drilling sheet metal screws to mechanically secure the connection; then it was air sealed using UL-181 fiber-reinforced duct sealant mastic paste
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This rigid metal duct connection was taped with regular duct tape and became disconnected when the tape adhesive failed

This rigid metal duct connection was taped with regular duct tape and became disconnected when the tape adhesive failed
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This saddle take-off collar is used to connect a round sheet metal duct to another round sheet metal duct.

This saddle take-off collar is used to connect a round sheet metal duct to another round sheet metal duct.
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This semi-rigid clothes dryer exhaust duct has excessive length; the bends in the duct will severely restrict air flow and could lead to clogging of the duct by dryer lint

This semi-rigid clothes dryer exhaust duct has excessive length; the bends in the duct will severely restrict air flow and could lead to clogging of the duct by dryer lint
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This single-zone mini-split ductless heat pump has only one indoor wall-mounted unit and one outdoor unit.

This single-zone mini-split ductless heat pump has only one indoor wall-mounted unit and one outdoor unit.
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This supply outlet is covered and sealed prior to a duct leakage test at final.

This supply outlet is covered and sealed prior to a duct leakage test at final.
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This take-off collar for a round metal duct is secured to the HVAC plenum using #7 x ½-inch self-piercing/self-drilling sheet metal screws.

This take-off collar for a round metal duct is secured to the HVAC plenum using #7 x ½-inch self-piercing/self-drilling sheet metal screws.
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This traditional centrally ducted heat pump heats and cools the entire home through a network of ducts.

This traditional centrally ducted heat pump heats and cools the entire home through a network of ducts.
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This typical central ductwork system for a multifamily building includes all ductwork sections, such as vertical risers, main trunks, horizontal run outs, branches, and take-offs

This typical central ductwork system for a multifamily building includes all ductwork sections, such as vertical risers, main trunks, horizontal run outs, branches, and take-offs
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This typical dropped ceiling hallway chase shows a complicated air sealing scheme where chase ceiling drywall meets sidewall top plates

This typical dropped ceiling hallway chase shows a complicated air sealing scheme where chase ceiling drywall meets sidewall top plates
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This utility room houses a high-efficiency gas boiler to provide hot water for the radiant floor heating system and faucets. It also has a central air source heat pump and an energy recovery ventilator.

This utility room houses a high-efficiency gas boiler to provide hot water for the radiant floor heating system and faucets. It also has a central air source heat pump and an energy recovery ventilator.
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To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back

To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back
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To keep chase width to a minimum, use flat sheet metal as opposed to a collar and flex duct for supplies into rooms where the chase is located

To keep chase width to a minimum, use flat sheet metal as opposed to a collar and flex duct for supplies into rooms where the chase is located
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To measure air flow, a hole was made in this flex duct; a more accurate measurement could be taken if the duct material were rigid metal, not flex duct

To measure air flow, a hole was made in this flex duct; a more accurate measurement could be taken if the duct material were rigid metal, not flex duct
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To perform a duct leakage to outside test, the home must be pressurized using a blower door while the duct test is carried out at the same pressure.

To perform a duct leakage to outside test, the home must be pressurized using a blower door while the duct test is carried out at the same pressure.
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To prepare for a total duct test at final, cover all of the supply outlets and return inlets

To prepare for a total duct test at final, cover all of the supply outlets and return inlets
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To prepare for a total duct test at rough-in, cover all of the supply outlets and return inlets

To prepare for a total duct test at rough-in, cover all of the supply outlets and return inlets
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Total Duct Leakage Tests

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Total Rater-measured duct leakage ≤ 8 CFM25 per 100 sq. ft. of conditioned area

Total Rater-measured duct leakage ≤ 8 CFM25 per 100 sq. ft. of conditioned area
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Transfer grill sealed with mastic

Transfer grill sealed with mastic
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Transfer grille not sealed

Transfer grille not sealed