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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 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 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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Transom returns are installed over interior doors to provide a pathway for return air

Transom returns are installed over interior doors to provide a pathway for return air
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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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Turn on power to the water heater from the circuit breaker.

Turn on power to the water heater from the circuit breaker.
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Turning Off Electricity at the Circuit Box

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Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake

Two L-brackets or seismic snubbers are installed at each corner of the HVAC unit and a vibration isolator or spring mount is installed in each corner to anchor the unit while allowing for slight movement in an earthquake
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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
Video:

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

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Use a non-contact voltage tester to verify the electricity is off, then disconnect the electrical and water connections of the old water heater tank.

Use a non-contact voltage tester to verify the electricity is off, then disconnect the electrical and water connections of the old water heater tank.
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Use only Underwriters Laboratory UL-181 approved tape

Use only Underwriters Laboratory UL-181 approved tape
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Use the wall switch to turn on the bathroom exhaust fan

Use the wall switch to turn on the bathroom exhaust fan
Presentation:

Variable Capacity Comfort Systems and Smart Ventilation Systems in High-Performance Homes

Variable Capacity Comfort Systems and Smart Ventilation Systems in High-Performance Homes
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Velocity measurement locations for round and rectangular ducts; velocity measurements should be taken at several locations representative of equal sectional areas across the duct cross-sectional area

Velocity measurement locations for round and rectangular ducts; velocity measurements should be taken at several locations representative of equal sectional areas across the duct cross-sectional area
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Vented Attic vs Unvented Cathedral Attic Air Flow

Vented Attic vs Unvented Cathedral Attic Air Flow
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Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics

Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics
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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