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Wrong - the CFM rating may not meet the performance specification once installed, and the sone rating is too high.

Wrong - the CFM rating may not meet the performance specification once installed, and the sone rating is too high.
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Wrong - The furnace intake and exhaust are too close to each other and are missing rodent screening.

Wrong - The furnace intake and exhaust are too close to each other and are missing rodent screening.
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Wrong - The furnace intake and exhaust are too close to each other and should be facing different directions.

Wrong - The furnace intake and exhaust are too close to each other and should be facing different directions.
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Wrong - The IRC prohibits the use of flex duct for kitchen exhaust and only permits PVC duct for downdraft systems that meet specific exceptions; also, gaps at the ceiling have not been air sealed.

Wrong - The IRC prohibits the use of flex duct for kitchen exhaust and only permits PVC duct for downdraft systems that meet specific exceptions; also, gaps at the ceiling have not been air sealed.
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Wrong - The IRC requires that kitchen exhaust ducts terminate outside, at least 3 feet from operable windows.

Wrong - The IRC requires that kitchen exhaust ducts terminate outside, at least 3 feet from operable windows.
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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 - Two exhaust terminations are joined in a roughly cut, restrictive hole that is not air sealed.

Wrong - Two exhaust terminations are joined in a roughly cut, restrictive hole that is not air sealed.
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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 – Air sealing and fastening of this duct take-off has been damaged during construction, causing a large gap in the right-hand side of the connection that will reduce air delivered to living spaces and make it difficult to balance the system

Wrong – Air sealing and fastening of this duct take-off has been damaged during construction, causing a large gap in the right-hand side of the connection that will reduce air delivered to living spaces and make it difficult to balance the system
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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