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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 - Flex duct pinched by bracing
Wrong - Flex duct resting on floor compressing insulation and causing condensation
Wrong - Flex duct with sharp turn restricting air flow
Wrong - Not enough straps were used to hang this flex duct so it is sagging, restricting air flow
Wrong - This flex duct is so twisted air flow is greatly restricted
Wrong -The duct does not have enough support so it is sagging and compressing the duct
Wrong – Chase not capped
Wrong – Excessive bends in flex ducts
Wrong – Fiber board duct is not sealed at seams; flex duct is sealed with duct tape not mastic tape or UL-181 metal tape.
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 – This metal duct is crushed, is sealed with duct tape instead of mastic or UL-181 metal tape, and is not correctly supported.
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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