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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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To test bathroom exhaust fan airflow, hold a tissue up to the fan while it is running; if it holds, airflow is good.

To test bathroom exhaust fan airflow, hold a tissue up to the fan while it is running; if it holds, airflow is good.
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Top view showing how the chimney is attached to at least four ceiling joists running parallel to the exterior wall.

Top view showing how the chimney is attached to at least four ceiling joists running parallel to the exterior wall.
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Top view showing how the chimney is attached to ceiling joists that run perpendicular to the exterior wall.

Top view showing how the chimney is attached to ceiling joists that run perpendicular to the exterior wall.
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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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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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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 a vacuum brush attachment or a soft dry cloth to clean the light fixture of the exhaust fan/light

Use a vacuum brush attachment or a soft dry cloth to clean the light fixture of the exhaust fan/light