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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
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Wrong: Ducts are not laid across the lower truss cords or ceiling, but are hung from the rafters by straps. As a result, ductwork is not buried

Wrong: Ducts are not laid across the lower truss cords or ceiling, but are hung from the rafters by straps. As a result, ductwork is not buried
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Wrong: Ductwork is not fully encapsulated with ccSPF insulation. The duct jacket is still fully visible at sections of the duct

Wrong: Ductwork is not fully encapsulated with ccSPF insulation. The duct jacket is still fully visible at sections of the duct
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Wrong: Insulation not fully enclosing duct chase

Wrong: Insulation not fully enclosing duct chase
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Wrong: Open wall cavities in the un-air-sealed return plenum connect the plenum to attic spaces

Wrong: Open wall cavities in the un-air-sealed return plenum connect the plenum to attic spaces
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Wrong: open wall cavity connected to this return air plenum is allowing cellulose attic insulation to be pulled into the furnace

Wrong: open wall cavity connected to this return air plenum is allowing cellulose attic insulation to be pulled into the furnace
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Wrong: Sized per Approach 1 or 2, this heat pump’s modulating zone has a small overlap with the home’s heating load line, resulting in a large amount of short-cycling; the unit will require backup heat when the temperature is below 25°F

Wrong: Sized per Approach 1 or 2, this heat pump’s modulating zone has a small overlap with the home’s heating load line, resulting in a large amount of short-cycling; the unit will require backup heat when the temperature is below 25°F
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Wrong: Sized per Approach 3, there is minimal overlap between this heat pump’s modulating zone and the home’s heating load line, causing excessive short-cycling; it will require backup heat and may not contribute significantly at temperatures below 5°F

Wrong: Sized per Approach 3, there is minimal overlap between this heat pump’s modulating zone and the home’s heating load line, causing excessive short-cycling; it will require backup heat and may not contribute significantly at temperatures below 5°F
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Wrong: Sized per Approach 3, there is small overlap between this heat pump’s modulating zone and the home’s heating load line, resulting in excessive short-cycling; it will require backup heat when the temperature is below 5°F

Wrong: Sized per Approach 3, there is small overlap between this heat pump’s modulating zone and the home’s heating load line, resulting in excessive short-cycling; it will require backup heat when the temperature is below 5°F
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Wrong: The door and filter were removed, allowing unfiltered air to enter the air handler leading to premature failure of the system due to dirt accumulation.

Wrong: The door and filter were removed, allowing unfiltered air to enter the air handler leading to premature failure of the system due to dirt accumulation.
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Wrong: The return plenum is not air sealed to separate it from the wall cavities and it should not be used for storage

Wrong: The return plenum is not air sealed to separate it from the wall cavities and it should not be used for storage