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Wrong - Flex duct with sharp turn restricting air flow

Wrong - Flex duct with sharp turn restricting air flow
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Wrong - Furnace return air filter is dirty and needs to be replaced.

Wrong - Furnace return air filter is dirty and needs to be replaced.
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Wrong - Heat ERV energy exchange core has become completely clogged with dirt.

Wrong - Heat ERV energy exchange core has become completely clogged with dirt.
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Wrong - Hole in duct is not sealed and duct joint to subfloor is not sealed.

Wrong - Hole in duct is not sealed and duct joint to subfloor is not sealed.
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Wrong - Hole in duct needs to be sealed.

Wrong - Hole in duct needs to be sealed.
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Wrong - Home owner has ignored HVAC system warning to replace air filter.

Wrong - Home owner has ignored HVAC system warning to replace air filter.
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Wrong - Home owner has ignored system alerts on smart thermostat.

Wrong - Home owner has ignored system alerts on smart thermostat.
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Wrong - HVAC metal cabinet seam is not sealed with mastic or metal tape.

Wrong - HVAC metal cabinet seam is not sealed with mastic or metal tape.
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Wrong - HVAC return air filter has not been replaced for over a year.

Wrong - HVAC return air filter has not been replaced for over a year.
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Wrong - HVAC rigid metal duct seam needs to be air sealed with mastic or metal tape.

Wrong - HVAC rigid metal duct seam needs to be air sealed with mastic or metal tape.
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Wrong - In floodplains, the interior grade elevation should be equal to or higher than the exterior grade as shown on right.

Wrong - In floodplains, the interior grade elevation should be equal to or higher than the exterior grade as shown on right.
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Wrong - Leaks in the roof sheathing can allow water to get in and wet the drywall, providing fertile ground for mold.

Wrong - Leaks in the roof sheathing can allow water to get in and wet the drywall, providing fertile ground for mold.
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Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.

Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.
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Wrong - Mold can spread rapidly in flood damaged homes if materials aren't dried quickly.

Wrong - Mold can spread rapidly in flood damaged homes if materials aren't dried quickly.
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Wrong - Not enough straps were used to hang this flex duct so it is sagging, restricting air flow

Wrong - Not enough straps were used to hang this flex duct so it is sagging, restricting air flow
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Wrong - Penetrations in walls for ducts should be air sealed to reduce air leakage.

Wrong - Penetrations in walls for ducts should be air sealed to reduce air leakage.
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Wrong - Recessed can light is compressing duct work.

Wrong - Recessed can light is compressing duct work.
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Wrong - Seam in duct boot is not sealed.

Wrong - Seam in duct boot is not sealed.
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Wrong - Seam in round metal duct is not sealed.

Wrong - Seam in round metal duct is not sealed.
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Wrong - Seams and holes in duct boot need to be sealed.

Wrong - Seams and holes in duct boot need to be sealed.
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Wrong - Seams at duct elbow are not fully sealed with mastic.

Wrong - Seams at duct elbow are not fully sealed with mastic.
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Wrong - Seams in metal ducting are not sealed.

Wrong - Seams in metal ducting are not sealed.
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Wrong - Terminate exhaust fan ducts outdoors, not "near" the outdoors

Wrong - Terminate exhaust fan ducts outdoors, not "near" the outdoors
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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.