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Whole house ventilation ensures adequate indoor air quality

Whole house ventilation ensures adequate indoor air quality
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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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With exhaust-only ventilation, the building is under negative pressure

With exhaust-only ventilation, the building is under negative pressure
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With supply-only ventilation, the building is under positive pressure

With supply-only ventilation, the building is under positive pressure
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With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.

With the register grill removed, very large gaps are visible around the edges of this duct boot between the duct boot and the drywall; the gaps can be closed with screw or heavy staples then sealed with caulk, mastic, or metal tape.
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Wrong - Air conditioning compressor unit should be sitting on concrete pad installed directly on ground.

Wrong - Air conditioning compressor unit should be sitting on concrete pad installed directly on ground.
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Wrong - Air filter was compressed and may not function effectively to filter return air.

Wrong - Air filter was compressed and may not function effectively to filter return air.
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Wrong - Air leakage from the conditioned space to the basement foundation wall can lead to condensation or moisture issues in a conventional blanket insulation installation.

Wrong - Air leakage from the conditioned space to the basement foundation wall can lead to condensation or moisture issues in a conventional blanket insulation installation.
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Wrong - Basement rim joist not sealed.

Wrong - Basement rim joist not sealed.
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Wrong - Basement window not sealed.

Wrong - Basement window not sealed.
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Wrong - Ceiling HVAC register is improperly installed on an angled ceiling.

Wrong - Ceiling HVAC register is improperly installed on an angled ceiling.
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Wrong - Condensate pipe is draining onto basement floor.

Wrong - Condensate pipe is draining onto basement floor.
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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 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 - 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.