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The floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing

The floor cavities under this attic kneewall are completely open to the unconditioned attic space and a prime target for wind washing
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The gap between the air filter and the return duct opening has been sealed with tape that will stop air flow but is easily pulled off or cut through when the filter needs to be replaced.

The gap between the air filter and the return duct opening has been sealed with tape that will stop air flow but is easily pulled off or cut through when the filter needs to be replaced.
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The green framing is lumber that was pressure treated with borate to increase its resistance to termites, mold, and moisture

The green framing is lumber that was pressure treated with borate to increase its resistance to termites, mold, and moisture
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The individual exhaust systems for each dwelling unit in this multifamily building result in large numbers of penetrations in the exterior façade

The individual exhaust systems for each dwelling unit in this multifamily building result in large numbers of penetrations in the exterior façade
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The light fixture is connected to the exhaust fan with an electric wire which is sometimes hard wired but in this case is plugged in so it can be unplugged to clean the light fixture and access the fan for cleaning

The light fixture is connected to the exhaust fan with an electric wire which is sometimes hard wired but in this case is plugged in so it can be unplugged to clean the light fixture and access the fan for cleaning
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The manometer hose for a duct leakage test is connected to a static pressure probe which will be inserted into a duct with the tip pointing into the oncoming air stream

The manometer hose for a duct leakage test is connected to a static pressure probe which will be inserted into a duct with the tip pointing into the oncoming air stream
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The manufacturer’s label found on this exhaust fan housing shows a sone rating of 1.0

The manufacturer’s label found on this exhaust fan housing shows a sone rating of 1.0
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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
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The nut holding the light housing in place in this combination exhaust fan/light can be unscrewed by hand

The nut holding the light housing in place in this combination exhaust fan/light can be unscrewed by hand
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The OSB roof decking product comes with an adhered radiant foil barrier which helps to prevent heat transfer in or out of the vented attic, while R-13 unfaced fiberglass fills the advanced-framed 2x6 walls.

The OSB roof decking product comes with an adhered radiant foil barrier which helps to prevent heat transfer in or out of the vented attic, while R-13 unfaced fiberglass fills the advanced-framed 2x6 walls.
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The pointed tip of this static pressure probe should point directly upstream into the oncoming airflow

The pointed tip of this static pressure probe should point directly upstream into the oncoming airflow
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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).
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The seams in the ceiling drywall are sealed from the attic side with spray foam.

The seams in the ceiling drywall are sealed from the attic side with spray foam.
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The soffit dam and baffle allow air to flow through the vents without disturbing the insulation covering the top plates

The soffit dam and baffle allow air to flow through the vents without disturbing the insulation covering the top plates
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The spray foam-insulated attic provides a temperate place for the ERV ducts, which provide filtered fresh air to every room in the house.

The spray foam-insulated attic provides a temperate place for the ERV ducts, which provide filtered fresh air to every room in the house.
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The stud cavities in this balloon-framed wall do not have blocking where the attic floor abuts it; this allows air to flow from inside the home to the attic above.

The stud cavities in this balloon-framed wall do not have blocking where the attic floor abuts it; this allows air to flow from inside the home to the attic above.
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The test fan for this central ERV duct leakage test is connected to the duct system from inside the ERV cabinet

The test fan for this central ERV duct leakage test is connected to the duct system from inside the ERV cabinet
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The test fan for this rooftop duct test is connected to the central exhaust duct via a transition plate at the rooftop curb

The test fan for this rooftop duct test is connected to the central exhaust duct via a transition plate at the rooftop curb
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The thermal boundary for a gable roof can be located at either a) the flat ceiling with a vented attic or b) the roof line for an unvented attic

The thermal boundary for a gable roof can be located at either a) the flat ceiling with a vented attic or b) the roof line for an unvented attic
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The trash chute and trash room in a multistory multifamily building are depressurized with exhaust fans to minimize odors.

The trash chute and trash room in a multistory multifamily building are depressurized with exhaust fans to minimize odors.
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The Truth about insulation in a hot climate

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The unvented attic is insulated along the underside of the roof deck with 7 inches (R-49) of closed-cell spray foam, providing vaulted ceilings and a conditioned knee wall space for ducting.

The unvented attic is insulated along the underside of the roof deck with 7 inches (R-49) of closed-cell spray foam, providing vaulted ceilings and a conditioned knee wall space for ducting.
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The vented cover of this bathroom exhaust fan is held in place with spring-loaded mounting wires

The vented cover of this bathroom exhaust fan is held in place with spring-loaded mounting wires
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The ventilation space in this vented over-roof keeps the roof cool to prevent ice dams over the unvented attic

The ventilation space in this vented over-roof keeps the roof cool to prevent ice dams over the unvented attic