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Wide saddle support provides sturdy support for the turn without pinching the flex duct

Wide saddle support provides sturdy support for the turn without pinching the flex duct
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Wind speeds increase significantly with height above ground

Wind speeds increase significantly with height above ground
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World's Whitest Paint: radiative cooling helps to fight climate change

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Wrong - Code requires a kitchen exhaust fan duct to be a smooth metal duct (galvanized steel, stainless steel, or copper) and to terminate outside, not in an attic or crawlspace.

Wrong - Code requires a kitchen exhaust fan duct to be a smooth metal duct (galvanized steel, stainless steel, or copper) and to terminate outside, not in an attic or crawlspace.
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Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.

Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.
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Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.

Wrong - Duct insulation and vapor barrier do not cover all of the flex duct.
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Wrong - Duct juncture seam should be sealed with metal tape or mastic.

Wrong - Duct juncture seam should be sealed with metal tape or mastic.
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Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.

Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.
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Wrong - Duct-duct joint is not sealed.

Wrong - Duct-duct joint is not sealed.
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Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.

Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.
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Wrong - Flex duct is improperly attached and sealed to duct boot.

Wrong - Flex duct is improperly attached and sealed to duct boot.
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Wrong - Flex duct is prohibited for kitchen exhaust fans by the IRC.

Wrong - Flex duct is prohibited for kitchen exhaust fans by the IRC.
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Wrong - Flex duct pinched by bracing

Wrong - Flex duct pinched by bracing
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Wrong - Flex duct resting on floor compressing insulation and causing condensation

Wrong - Flex duct resting on floor compressing insulation and causing condensation
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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 - Flex ducts are prohibited by the IRC for kitchen exhaust and, at 28 feet, this duct is too long to be effective.

Wrong - Flex ducts are prohibited by the IRC for kitchen exhaust and, at 28 feet, this duct is too long to be effective.
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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 - If this kitchen exhaust duct had been extended a few inches, at least one bend could have been eliminated.

Wrong - If this kitchen exhaust duct had been extended a few inches, at least one bend could have been eliminated.
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Wrong - Kitchen exhaust ducts are prohibited from terminating within 3 feet of an operable window or near gable vents.

Wrong - Kitchen exhaust ducts are prohibited from terminating within 3 feet of an operable window or near gable vents.
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Wrong - Kitchen exhaust fans must be located directly over the stove top to be effective at capturing and removing cooking pollutants.

Wrong - Kitchen exhaust fans must be located directly over the stove top to be effective at capturing and removing cooking pollutants.
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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 - 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.