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The electrical conduit (metal) on the left has been sealed to the subfloor using fire-rated caulk, while the penetration for the yellow electrical wire on the right has not been air-sealed yet.

The electrical conduit (metal) on the left has been sealed to the subfloor using fire-rated caulk, while the penetration for the yellow electrical wire on the right has not been air-sealed yet.
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The exterior caulking around this window is clearly cracked and peeling, indicating that the caulking is no longer performing well and should be replaced.

The exterior caulking around this window is clearly cracked, indicating that the caulking is no longer performing well and should be replaced.
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The fan was removed from this exhaust fan box to access and air seal the seams with metal tape and the holes in the housing with canned spray foam

The fan was removed from this exhaust fan box to access and air seal the seams with metal tape and the holes in the housing with canned spray foam
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The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.

The gap between the duct boot and the drywall is air sealed by covering the seam with fiberglass mesh tape and mastic.
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The gaps around this duct boot are sealed with canned spray foam.

The gaps around this duct boot are sealed with canned spray foam.
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The gaps around this HVAC boot have been air sealed with spray foam to limit air leakage between the conditioned space and the basement or crawlspace.

The gaps around this HVAC boot have been air sealed with spray foam to limit air leakage between the conditioned space and the basement or crawlspace.
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The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.

The gaps between the sheet metal of the duct boot and the drywall are clearly visible in this image.
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The grey ring around the back of this LED retrofit ceiling fixture trim kits is a foam gasket to air seal the fixture.

The grey ring around the back of this LED retrofit ceiling fixture trim kits is a foam gasket to air seal the fixture.
Case Study:

The Habitat for Humanity of Metro Denver Zero Energy Demonstration Home

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The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.

The hole in the drywall was cut overly large for this heating register, allowing air to leak into or out of the wall cavities.
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The holes around these plumbing pipes in the floor slab and in the sink cabinet have been sealed with canned spray foam to stop air leakage.

The holes around these plumbing pipes in the floor slab and in the sink cabinet have been sealed with canned spray foam to stop air leakage.
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The home is sheathed with rigid foam insulation and all seams and holes are taped to provide a continuous air barrier.

The home is sheathed with rigid foam insulation and all seams and holes are taped to provide a continuous air barrier.
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The hoses on this manometer are correctly connected with the red hose connected for the house with reference to outside and the green hose connected for the fan with reference to the house for a blower door test to show air leakage by pressure differences

The hoses on this manometer are correctly connected with the red hose connected for the house with reference to outside and the green hose connected for the fan with reference to the house for a blower door test to show air leakage by pressure differences when the house is depressurized to about 50 Pascals.
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The I-joist is continuous along the shared wall and serves as a natural air barrier between the garage and the house

The I-joist is continuous along the shared wall and serves as a natural air barrier between the garage and the house
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The jagged edges of the cutout around this ceiling exhaust fan require canned spray foam, metal tape, or fiberglass mesh tape and mastic to air seal the gaps and keep conditioned air from the home from escaping into the attic

The jagged edges of the cutout around this ceiling exhaust fan require canned spray foam, metal tape, or fiberglass mesh tape and mastic to air seal the gaps and keep conditioned air from the home from escaping into the attic
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The joints in the ducts and air handler are sealed with mastic.

The joints in the ducts and air handler are sealed with mastic.
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The large hole that was cut in the subfloor penetration for this HVAC duct has been air-sealed using sheet metal, mastic, and metal tape.

The large hole that was cut in the subfloor penetration for this HVAC duct has been air-sealed using sheet metal, mastic, and metal tape.
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The location of furnace and water heater flues can be identified by going outside and looking for metal pipes coming through the roof.

The location of furnace and water heater flues can be identified by going outside and looking for metal pipes coming through the roof.
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The missing top plate in a kneewall was covered with lumber and rigid foam insulation and then sealed with spray foam

The missing top plate in a kneewall was covered with lumber and rigid foam insulation and then sealed with spray foam
Case Study:

The New American Home 2004 Las Vegas, Nevada

Case Study:

The New American Home 2011 Orlando, Florida

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The original corner seam is air-sealed with caulk, then rigid foam is installed on the existing garage ceiling and walls, and finally covered with drywall.

The original corner seam is air-sealed with caulk, then rigid foam is installed on the existing garage ceiling and walls, and finally covered with drywall.
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The party wall interfaces of this multifamily building are sealed with air-sealing tape

The party wall interfaces of this multifamily building are sealed with air-sealing tape
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The polyethylene ceiling vapor barrier is sealed to form an air barrier around the exhaust fan in this very cold climate location (≥ CZ 6).

The polyethylene ceiling vapor barrier is sealed to form an air barrier around the exhaust fan in this very cold climate location (≥ CZ 6).