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Ventilation inlet is too close to exhaust outlets and does not extend at least 2 ft. above the roof deck

Ventilation inlet is too close to exhaust outlets and does not extend at least 2 ft. above the roof deck
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Ventilation inlet is too close to the ground and is being blocked by the grass

Ventilation inlet is too close to the ground and is being blocked by the grass
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Ventilation tied into the return with a mechanical damper

Ventilation tied into the return with a mechanical damper
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Ventilation tied into the return without a mechanical damper

Ventilation tied into the return without a mechanical damper
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Wall Mount Chimney Range Hood for Aesthetic Use, Newport Partners.

Wall Mount Chimney Range Hood for Aesthetic Use, Newport Partners.
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Washable range hood fan filters can be washed in the dishwasher.

Washable range hood fan filters can be washed in the dishwasher.
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Washable range hood filters can be soaked in a pan of warm water with dish soap

Washable range hood filters can be soaked in a pan of warm water with dish soap
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When architects and builders think of the house as a systems, all of the parts are designed to work together for a healthy, durable home that minimizes builder callbacks while cutting energy, maintenance, and repair costs down the road.

When architects and builders think of the house as a systems, all of the parts are designed to work together for a healthy, durable home that minimizes builder callbacks while cutting energy, maintenance, and repair costs down the road.
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When closing the grille cover over the return duct after replacing the furnace filter, make sure that the filter is properly sitting in the space and the latches or screws are securely fastened.

When closing the grille cover over the return duct after replacing the furnace filter, make sure that the filter is properly sitting in the space and the latches or screws are securely fastened.
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When installing piping and wiring, do not block access to the filter

When installing piping and wiring, do not block access to the filter
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When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples

When wrapping metal ducts with insulation allow two inches of overlap and staple along the seam with outward clinching staples
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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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Without an exhaust fan ducted to the exterior, particles resulting from cooking can accumulate on walls and ceilings, and will be present in the air where they can damage occupants' respiratory systems

Without an exhaust fan ducted to the exterior, particles resulting from cooking can accumulate on walls and ceilings, and will be present in the air where they can damage occupants' respiratory systems
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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 - 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 - 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 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.