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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.
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Wrong - The holes around the HRV ducting should be air sealed.

Wrong - The holes around the HRV ducting should be air sealed.
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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 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 - Vent screening on outdoor air intake has been clogged with dirt and screen has been pulled up into vent and is no longer covering the entire opening.

Wrong - Vent screening on outdoor air intake has been clogged with dirt and screen has been pulled up into vent and is no longer covering the entire opening.
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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 – 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 – Flex duct is coiled and looped

Wrong – Flex duct is coiled and looped
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Wrong – Flex duct is pinched

Wrong – Flex duct is pinched
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Wrong – The HVAC compressor was not adequately secured to an elevated platform and was washed away.

Wrong – The HVAC compressor was not adequately secured to an elevated platform and was washed away.
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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 – 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- 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: 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