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Wrong – The damper leading to the ductwork for a central ERV is closed during a duct leakage test; the duct tester is attached to the ERV cabinet, so this will only measure the air tightness of the ERV cabinet and not the duct system

Wrong – The damper leading to the ductwork for a central ERV is closed during a duct leakage test; the duct tester is attached to the ERV cabinet, so this will only measure the air tightness of the ERV cabinet and not the duct system
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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.
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Wrong – The kitchen exhaust fan duct is attached to flex duct, which is prohibited by code.

Wrong – The kitchen exhaust fan duct is attached to flex duct, which is prohibited by code.
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Wrong – The plastic seal of the open end of this duct is ripped; the test measurement will overestimate the duct leakage if the temporary seals are not very carefully completed

Wrong – The plastic seal of the open end of this duct is ripped; the test measurement will overestimate the duct leakage if the temporary seals are not very carefully completed
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Wrong – The rigid air barrier material between the cantilever and the conditioned space is not air sealed at the seams.

Wrong – The rigid air barrier material between the cantilever and the conditioned space is not air sealed at the seams.
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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 – 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.
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Wrong – This damper is closed, so the duct system is not entirely pressurized during the duct leakage test

Wrong – This damper is closed, so the duct system is not entirely pressurized during the duct leakage test
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Wrong – This duct boot is not sealed to the wall board

Wrong – This duct boot is not sealed to the wall board
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Wrong – This duct boot is sealed inside the boot for a duct leakage test; this fails to account for the ductwork leakage between the duct boot and the wall board

Wrong – This duct boot is sealed inside the boot for a duct leakage test; this fails to account for the ductwork leakage between the duct boot and the wall board
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Wrong – This ductwork is not sealed where the round duct is attached to the square duct riser

Wrong – This ductwork is not sealed where the round duct is attached to the square duct riser
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Wrong – This exhaust fan duct is wrong on several counts: it uses flex duct rather than smooth round metal duct as required by the IRC, the duct terminates inside of the wall assembly instead of outside, the opening is not large enough...

Wrong – This exhaust fan duct is wrong on several counts: it uses flex duct rather than smooth round metal duct as required by the IRC, the duct terminates inside of the wall assembly instead of outside, the opening is not large enough, and the end is crushed thus severely limiting air flow.
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Wrong – This fire damper is partly closed during a duct leakage test, resulting in an uneven pressure distribution and an inaccurate test result

Wrong – This fire damper is partly closed during a duct leakage test, resulting in an uneven pressure distribution and an inaccurate test result
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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 – This metal duct is crushed, is sealed with duct tape instead of mastic or UL-181 metal tape, and is not correctly supported.
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Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.

Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.
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Wrong – Vent sleeve not completely sealed

Wrong – Vent sleeve not completely sealed
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Wrong –Excessive length and a vertical angle on this dryer duct reduced air flow allowing the dryer duct to become completely clogged with dryer lint

Wrong –Excessive length and a vertical angle on this dryer duct reduced air flow allowing the dryer duct to become completely clogged with dryer lint
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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- 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).
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Wrong: Drywall does not extend beyond chase wall framing and is unsealed in a hallway dropped ceiling chase

Wrong: Drywall does not extend beyond chase wall framing and is unsealed in a hallway dropped ceiling chase
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Wrong: Drywall does not extend beyond the top plate of the interior walls. This installation has the potential for leakage at the sides where the ducts penetrate the side walls of the chase

Wrong: Drywall does not extend beyond the top plate of the interior walls. This installation has the potential for leakage at the sides where the ducts penetrate the side walls of the chase
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Wrong: Duct is hung between truss members by strapping and not buried

Wrong: Duct is hung between truss members by strapping and not buried
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Wrong: Ducts are held above the ceiling plane with strapping to provide a good angle into top-entry boots. Once the ceiling insulation is added, this duct will protrude from the ceiling insulation and will not be buried

Wrong: Ducts are held above the ceiling plane with strapping to provide a good angle into top-entry boots. Once the ceiling insulation is added, this duct will protrude from the ceiling insulation and will not be buried
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Wrong: Ducts are held from the rafters with strapping and a large beam prevents ducts from properly lying on the ceiling plane

Wrong: Ducts are held from the rafters with strapping and a large beam prevents ducts from properly lying on the ceiling plane