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Ventilation air inlet is too close to exhaust outlet
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 ≥ 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 inlet does not terminate high enough above the roof deck
Ventilation inlet is appropriately located above grade
Ventilation inlet is greater than 10 ft. from known contamination source
Ventilation inlet is greater than 10 ft. from known contamination source
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
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 the ground and is being blocked by the grass
Well sealed duct lifted into raised ceiling chase
When wrapping metal pipes with insulation allow two inches of overlap and staple along the seam with outward clinching staples
Wrong – Chase not capped
Wrong – Excessive bends in flex ducts
Wrong – Fibrous insulation does not air seal
Wrong – Flex duct is coiled and looped
Wrong – Flex duct is pinched
Wrong – Penetration hole is larger than duct and not sealed
Wrong – These flex ducts are pulled taut, which is correct but they are inadequately supported with straps that are spaced too far apart and are too tight causing pinching of the insulation and turns are sharp rather than gradual.
Wrong – Vent sleeve not completely sealed
Wrong- A tie strap should not be used over the duct outer liner because it can compress the insulation. Tuck in the fibrous insulation and seal the outer liner to the connecting duct with mastic or foil tape (Steven Winter Associates 2013).
Wrong: Blown insulation does not stick to raised duct chases
Wrong – Insulation not fully enclosing duct chase

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