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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 – 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 – Flue not sealed around opening

Wrong – Flue not sealed around opening
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Wrong – If a fireplace is desired, install a vented model not an unvented model.

Wrong – If a fireplace is desired, install a vented model not an unvented model.
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Wrong – Kitchen exhaust has not been air sealed

Wrong – Kitchen exhaust has not been air sealed
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Wrong – No rigid air barrier is installed behind fireplace

Wrong – No rigid air barrier is installed behind fireplace
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Wrong – Overly powerful kitchen exhaust fans can backdraft other combustion appliances in the home

Wrong – Overly powerful kitchen exhaust fans can backdraft other combustion appliances in the home
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Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal

Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal
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Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal

Wrong – Roughly cut hole that is larger than the fan, making it difficult to seal
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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 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 position of this exhaust fan does not allow the duct to route directly outside in as straight a path as possible.

Wrong – The position of this exhaust fan does not allow the duct to route directly outside in as straight a path as possible.
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Wrong – This exhaust duct extends far beyond what is needed to reach the roof; a short, straight, smooth rigid metal duct is best for exhaust ducts and exhausting to the soffit vent would be preferable.

Wrong – This exhaust duct extends far beyond what is needed to reach the roof; a short, straight, smooth rigid metal duct is best for exhaust ducts and exhausting to the soffit vent would be preferable.
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Wrong – This kitchen exhaust fan is not located directly above the stove top so it will be ineffective at removing cooking pollutants and it terminates within 3 feet of an operable window, which is prohibited by code.

Wrong – This kitchen exhaust fan is not located directly above the stove top so it will be ineffective at removing cooking pollutants and it terminates within 3 feet of an operable window, which is prohibited by code.
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Wrong – This kitchen exhaust is a recirculating model; kitchens should use exhaust fans that duct out through the roof to remove moisture and odors from the home

Wrong – This kitchen exhaust is a recirculating model; kitchens should use exhaust fans that duct out through the roof to remove moisture and odors from the home
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Wrong – Whole house fan installed with holes in surrounding platform that need to be air sealed

Wrong – Whole house fan installed with holes in surrounding platform that need to be air sealed
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Wrong – Whole house fan installed without an insulated cover

Wrong – Whole house fan installed without an insulated cover
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Wrong--No insulation installed behind fireplace

Wrong--No insulation installed behind fireplace