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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
Video:

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
Video:

Transfer Grilles (1)

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Transfer grills and jump ducts provide pathways for air to reach the centrally located HVAC return grille, even when bedroom doors are shut.

Transfer grills and jump ducts provide pathways for air to reach the centrally located HVAC return grille, even when bedroom doors are shut.
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Trunk to duct connections are only mechanically fastened and not sealed

Trunk to duct connections are only mechanically fastened and not sealed
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Trunk to duct connections are properly insulated and have been sealed with mastic

Trunk to duct connections are properly insulated and have been sealed with mastic
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Tuck any extra vapor barrier around and under the insulation and pull it tight to the connecting duct or boot to create a firmer surface to apply tape.

Tuck any extra vapor barrier around and under the insulation and pull it tight to the connecting duct or boot to create a firmer surface to apply tape.
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Twisting and compressing flex duct will block air flow

Twisting and compressing flex duct will block air flow
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Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic

Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic
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Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities

Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities
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Uninsulated, unsealed, or missing rim joists allow attic air and heat into the floor cavity

Uninsulated, unsealed, or missing rim joists allow attic air and heat into the floor cavity
Video:

University of Minnesota-NorthernSTAR: A Natural Gas-Fired Combi System for Space Heating and Hot Water

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Unsealed, uninsulated rim joists allow outside air and heat into the floor cavity

Unsealed, uninsulated rim joists allow outside air and heat into the floor cavity
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Use masking tape as a removable sealer to stop air from leaking around the return grille filter.

Use masking tape as a removable sealer to stop air from leaking around the return grille filter.
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Use only Underwriters Laboratory UL-181 approved tape

Use only Underwriters Laboratory UL-181 approved tape
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Ventilation air inlet is too close to exhaust outlet

Ventilation air inlet is too close to exhaust outlet
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Ventilation air inlet is too close to exhaust outlet

Ventilation air inlet is too close to exhaust outlet
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Ventilation air inlets ≥ 2 ft. above grade or roof deck in Climate Zones 1-3 or ≥ 4 ft. above grade or roof deck in Climate Zones 4-8 and not obstructed

Ventilation air inlets ≥ 2 ft. above grade or roof deck in Climate Zones 1-3 or ≥ 4 ft. above grade or roof deck in Climate Zones 4-8 and not obstructed
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Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust

Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust
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Ventilation inlet does not terminate high enough above the roof deck

Ventilation inlet does not terminate high enough above the roof deck
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Ventilation inlet is appropriately located above grade

Ventilation inlet is appropriately located above grade