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This IR camera image shows air leakage indicated by the dark purple streaks along the bottom plates and below the window sill, as well as some heat loss at the electric outlet.

This IR camera image shows air leakage indicated by the dark purple streaks along the bottom plates and below the window sill, as well as some heat loss at the electric outlet.
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This is the ceiling vent for a basic bathroom exhaust fan

This is the ceiling vent for a basic bathroom exhaust fan
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This kneewall has no top plate and the resulting gap provides a wide-open pathway for air and vapor to travel between the living space and the attic

This kneewall has no top plate and the resulting gap provides a wide-open pathway for air and vapor to travel between the living space and the attic
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This manometer is set up to show whole house air leakage with reference to the outside during a blower door test; the reading is showing 1,434 cfm of leakage when the home is depressurized to about 50 Pascals.

This manometer is set up to show whole house air leakage with reference to the outside during a blower door test; the reading is showing 1,434 cfm of leakage when the home is depressurized to about 50 Pascals.
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This narrow bottle brush was an effective tool for removing the debris between the blades of this bathroom exhaust fan

This narrow bottle brush was an effective tool for removing the debris between the blades of this bathroom exhaust fan
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This parapet wall has metal blocking and spray foam in the wall at the level of the roof insulation; this limits airflow within or through the wall cavity.

This parapet wall has metal blocking and spray foam in the wall at the level of the roof insulation; this limits airflow within or through the wall cavity.
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This parapet wall has no blocking to prevent the convection of cold air through the insulation, which significantly reduces the effectiveness of the insulation.

This parapet wall has no blocking to prevent the convection of cold air through the insulation, which significantly reduces the effectiveness of the insulation.
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This plan view shows compartmentalization of one floor of a multistory multifamily building; red lines are air barriers around vertical shafts and common areas; grey lines are air barriers between units; vestibules isolate elevators from corridors

This plan view shows compartmentalization of one floor of a multistory multifamily building; red lines are air barriers around vertical shafts and common areas; grey lines are air barriers between units; vestibules isolate elevators from corridors
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This three-stud corner was constructed to allow more insulation in the corner

This three-stud corner was constructed to allow more insulation in the corner
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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 vaulted ceiling has 7 inches of closed-cell spray foam plus an R-22 unfaced mineral wool batt for a total attic insulation value of R-68.

This vaulted ceiling has 7 inches of closed-cell spray foam plus an R-22 unfaced mineral wool batt for a total attic insulation value of R-68.
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This window header has been insulated with rigid foam and air sealed with house wrap tape and all wood-to-wood joints are caulked.

This window header has been insulated with rigid foam and air sealed with house wrap tape and all wood-to-wood joints are caulked.
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Thorough air sealing is one way the Habitat for Humanity affiliate in Loudon County, FL, improves the efficiency and weather resistance of its homes.

Thorough air sealing is one way the Habitat for Humanity affiliate in Loudon County, FL, improves the efficiency and weather resistance of its homes.
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Three inches of closed-cell spray foam (R-19) and 7.5 inches (R-28) of open-cell spray foam was installed below the roof sheathing in this cathedral ceiling.

Three inches of closed-cell spray foam (R-19) and 7.5 inches (R-28) of open-cell spray foam was installed below the roof sheathing in this cathedral ceiling.
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Three locations and methods for installing a roof deck radiant barrier in new construction

Three locations and methods for installing a roof deck radiant barrier in new construction
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To minimize air leakage through electrical boxes, the boxes were either wrapped with fire-resistant putty (required at fire-rated walls) or wire penetrations were foamed and the boxes were caulked to the drywall.

To minimize air leakage through electrical boxes, the boxes were either wrapped with fire-resistant putty (required at fire-rated walls) or wire penetrations were foamed and the boxes were caulked to the drywall.
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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 remove old exterior caulk, use a utility knife (left) or a putty knife (right) to cut along both edges.

To remove old exterior caulk, use a utility knife (left) or a putty knife (right) to cut along both edges.
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To seal a partition wall at the floor-exterior wall junction: a. install self-adhered membrane over subfloor, rim joist, and partition wall; b. construct walls of next floor, install more flashing over first flashing and up partition wall

To seal a partition wall at the floor-exterior wall junction: a. install self-adhered membrane over subfloor, rim joist, and partition wall; b. construct walls of next floor, install more flashing over first flashing and up partition wall
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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.
Video:

Total Duct Leakage Tests