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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 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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Tornado Safe Room Options

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Tornado, Hurricane, and Earthquake Risk Profile of 379 U.S. Urban Areas

Tornado, Hurricane, and Earthquake Risk Profile of 379 U.S. Urban Areas
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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
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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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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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Typical roof truss top chord bracing

Typical roof truss top chord bracing
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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
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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