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Wrong - The seam around the duct boot where the duct boot enters the trunk duct has not been completely sealed with mesh tape and mastic.

Wrong - The seam around the duct boot where the duct boot enters the trunk duct has not been completely sealed with mesh tape and mastic.
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Wrong - The support strap for the duct is too tight and the radius of the turn is too sharp.

Wrong - The support strap for the duct is too tight and the radius of the turn is too sharp.
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Wrong - This flex duct is so twisted air flow is greatly restricted

Wrong - This flex duct is so twisted air flow is greatly restricted
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Wrong - This is a poorly sealed chase with no solid air barriers along the sides of the chase and no caulk around the electrical wires installed through the ceiling of the chase.

Wrong - This is a poorly sealed chase with no solid air barriers along the sides of the chase and no caulk around the electrical wires installed through the ceiling of the chase.
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Wrong - This kitchen exhaust duct uses flex duct, which is prohibited by code, and the duct’s 22-foot length and multiple bends will slow the movement of pollutants out of the home.

Wrong - This kitchen exhaust duct uses flex duct, which is prohibited by code, and the duct’s 22-foot length and multiple bends will slow the movement of pollutants out of the home.
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Wrong - This tape product is not code approved for duct sealing.

Wrong - This tape product is not code approved for duct sealing.
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Wrong -The duct does not have enough support so it is sagging and compressing the duct

Wrong -The duct does not have enough support so it is sagging and compressing the duct
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Wrong – A tear in the outer jacket of this duct shows where an in-line airflow measurement was made; the inner duct was not sealed and created a duct leak.

Wrong – A tear in the outer jacket of this duct shows where an in-line airflow measurement was made; the inner duct was not sealed and created a duct leak.
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Wrong – Chase not capped

Wrong – Chase not capped
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Wrong – Don’t use nails to fasten poly vapor barrier around flex ducts; it will allow moist air to reach the ducts where it could condense and ruin the insulation.

Wrong – Don’t use nails to fasten poly vapor barrier around flex ducts; it will allow moist air to reach the ducts where it could condense and ruin the insulation.
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Wrong – Duct is pulling away from ceiling because it is not sealed to the ceiling

Wrong – Duct is pulling away from ceiling because it is not sealed to the ceiling
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Wrong – Duct is pulling away from floor because it is not sealed to floor

Wrong – Duct is pulling away from floor because it is not sealed to floor
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Wrong – Excessive bends in flex ducts

Wrong – Excessive bends in flex ducts
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Wrong – Exhaust fan ducts must be smooth metal ducts; flex duct is not permitted by the IRC.

Wrong – Exhaust fan ducts must be smooth metal ducts; flex duct is not permitted by the IRC.
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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 – Fiber board duct is not sealed at seams; flex duct is sealed with duct tape not mastic tape or UL-181 metal tape.
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Wrong – Fibrous insulation does not air seal

Wrong – Fibrous insulation does not air seal
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Wrong – Flex duct is coiled and looped

Wrong – Flex duct is coiled and looped
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Wrong – Flex duct is pinched

Wrong – Flex duct is pinched
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Wrong – Insulation should not be pinched where flex ducts connect to the trunk duct as compression of the insulation here can lead to cold spots and condensation on the duct surface.

Wrong – Insulation should not be pinched where flex ducts connect to the trunk duct as compression of the insulation here can lead to cold spots and condensation on the duct surface.
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Wrong – It is difficult to test the air flow in this fresh air intake duct due to poor access and inadequate length of straight duct to get an accurate in-line flow measurement.

Wrong – It is difficult to test the air flow in this fresh air intake duct due to poor access and inadequate length of straight duct to get an accurate in-line flow measurement.
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Wrong – Penetration hole is larger than duct and not sealed

Wrong – Penetration hole is larger than duct and not sealed
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Wrong – The duct for this kitchen exhaust fan is made of flex duct instead of smooth metal duct and the duct is not properly supported.

Wrong – The duct for this kitchen exhaust fan is made of flex duct instead of smooth metal duct and the duct is not properly supported.
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Wrong – the exhaust terminal for a clothes dryer should not be covered with a screen which could trap lint; instead, cover it with a hooded, louvered damper

Wrong – the exhaust terminal for a clothes dryer should not be covered with a screen which could trap lint; instead, cover it with a hooded, louvered damper
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Wrong – the interior seam of the branch duct to trunk duct juncture is sealed with mastic but there are gaps around the exterior seam that should also be sealed with mastic or metal tape.

Wrong – the interior seam of the branch duct to trunk duct juncture is sealed with mastic but there are gaps around the exterior seam that should also be sealed with mastic or metal tape.