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Use a vacuum brush attachment to clean the exhaust fan motor and blades

Use a vacuum brush attachment to clean the exhaust fan motor and blades
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Use masking tape as a removable sealer to stop air from leaking around the return grille filter.

Use masking tape as a removable sealer to stop air from leaking around the return grille filter.
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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 brush attachment on your vacuum to remove dust and debris on the bathroom exhaust fan vents

Use the brush attachment on your vacuum to remove dust and debris on the bathroom exhaust fan vents
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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
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Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust

Ventilation air inlets located ≥10 ft. of stretched-string distance from known contamination sources such as stack, vent, exhaust hood, or vehicle exhaust
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Ventilation inlet does not terminate high enough above the roof deck

Ventilation inlet does not terminate high enough above the roof deck
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Ventilation inlet is appropriately located above grade

Ventilation inlet is appropriately located above grade
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Ventilation inlet is greater than 10 ft. from known contamination source

Ventilation inlet is greater than 10 ft. from known contamination source
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Ventilation inlet is greater than 10 ft. from known contamination source

Ventilation inlet is greater than 10 ft. from known contamination source
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Ventilation inlet is not near any exhaust outlets/contamination sources and is at least 2 ft. above the roof deck

Ventilation inlet is not near any exhaust outlets/contamination sources and is at least 2 ft. above the roof deck
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Ventilation inlet is too close to exhaust outlets and does not extend at least 2 ft. above the roof deck

Ventilation inlet is too close to exhaust outlets and does not extend at least 2 ft. above the roof deck
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Ventilation inlet is too close to the ground and is being blocked by the grass

Ventilation inlet is too close to the ground and is being blocked by the grass
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Vents with screens should not be used for clothes dryer exhaust ducts because the screen can easily get clogged with dryer lint and stop air flow

Vents with screens should not be used for clothes dryer exhaust ducts because the screen can easily get clogged with dryer lint and stop air flow
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Visual inspection shows a considerable amount of dust has accumulated on this bathroom exhaust fan motor and fan blades

Visual inspection shows a considerable amount of dust has accumulated on this bathroom exhaust fan motor and fan blades
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Water Moisture Issues: Flashing Windows, Water Leaks, and Kick-Out Flashings

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Well sealed duct lifted into raised ceiling chase

Well sealed duct lifted into raised ceiling chase
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When installing exhaust fan ducts, use as few elbows as possible

When installing exhaust fan ducts, use as few elbows as possible
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When installing exhaust fan ducts, use rigid metal ductwork

When installing exhaust fan ducts, use rigid metal ductwork
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When installing exhaust fan ducts, use the shortest duct runs possible to the outside

When installing exhaust fan ducts, use the shortest duct runs possible to the outside
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When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor and pressure taps

When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor and pressure taps
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When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor

When using a theatrical fog machine to detect duct leakage, point the fog stream toward the outer edge of the test fan opening to avoid fouling the fan motor