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If there are gaps larger than ¼ inch around a chimney in the attic, install sheet metal to cover the openings, secure the sheet metal to surrounding framing with screws or heavy staples, and seal all joints and seams with fire-rated caulk.

If there are gaps larger than ¼ inch around a chimney in the attic, install sheet metal to cover the openings, secure the sheet metal to surrounding framing with screws or heavy staples, and seal all joints and seams with fire-rated caulk.
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If wall registers are desired, install HVAC ducts in interior wall cavities

If wall registers are desired, install HVAC ducts in interior wall cavities
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Inadequate amount of insulation installed with compression, misalignment, and voids

Inadequate amount of insulation installed with compression, misalignment, and voids
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Insert an electric leaf blower into the dryer exhaust duct and turn on at lowest setting to blow out the duct

Insert an electric leaf blower into the dryer exhaust duct and turn on at lowest setting to blow out the duct
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Install an air barrier behind fireplaces installed on exterior walls

Install an air barrier behind fireplaces installed on exterior walls
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Install bottom layer of rigid insulation

Install bottom layer of rigid insulation
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Install duct supports in line with ceiling trusses

Install duct supports in line with ceiling trusses
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Install ducts without excessive coils or loops

Install ducts without excessive coils or loops
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Install ducts without kinks or sharp bends

Install ducts without kinks or sharp bends
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Install sheet metal to cover the gaps around a flue pipe in the attic; attach with screws or heavy staples, then seal seams with fire-rated caulk or foam

. Install sheet metal to cover the gaps around a flue pipe in the attic; attach with screws or heavy staples, then seal seams with fire-rated caulk or foam
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Install supply registers in floors or ceilings to avoid routing ducts through exterior walls

Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
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Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot

Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
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Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot

Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
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Install wood framing cross pieces in the attic rafter bays on each side of the duct chase

Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
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Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring

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Insulated floor above garage - cavity insulation with 1 inch rigid insulation with 2x2 wood furring
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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed
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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed
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Insulation does not cover boot and is not sealed

Insulation does not cover boot and is not sealed
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Insulation for rigid ducts comes in large rolls like this 4-ft x 50-ft roll consisting of a Foil-Scrim-Kraft (FSK) vapor barrier attached to the fiberglass insulation.

Insulation for rigid ducts comes in large rolls like this 4-ft x 50-ft roll consisting of a Foil-Scrim-Kraft (FSK) vapor barrier attached to the fiberglass insulation.
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Jump ducts are installed in the ceiling to connect closed rooms with open space to provide a return air path and balance air pressure

Jump ducts are installed in the ceiling to connect closed rooms with open space to provide a return air path and balance air pressure
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Lay out duct so that no radius of a bend or turn is less than the diameter of the airway

Lay out duct so that no radius of a bend or turn is less than the diameter of the airway
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Louvers and jump ducts allow cross ventilation through rooms with closed doors

Louvers and jump ducts allow cross ventilation through rooms with closed doors
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Manual D details show duct size and chase path

Manual D details show duct size and chase path
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Manually seal around ceiling registers with foil tape

Manually seal around ceiling registers with foil tape