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Image:

Duct to boot connection of jump duct is properly sealed with mastic

Duct to boot connection of jump duct is properly sealed with mastic
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Duct to boot connection of jump duct not fastened and sealed

Duct to boot connection of jump duct not fastened and sealed
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Duct work is strapped to the chase ceiling

Duct work is strapped to the chase ceiling
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Duct work is uninsulated and not sealed at seams

Duct work is uninsulated and not sealed at seams
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Duct/pipe penetration with metal cap flashing and wood blocking for trim attachment

Duct/pipe penetration with metal cap flashing and wood blocking for trim attachment
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Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value

Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value
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Ducts are properly insulated and supported without compressing the insulation

Ducts are properly insulated and supported without compressing the insulation
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Ducts are run straight and supported properly

Ducts are run straight and supported properly
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Ducts crammed into cavity, kinked and sharply bent

Ducts crammed into cavity, kinked and sharply bent
Video:

Ducts Encapsulated in Spray Foam and Buried in Attic Insulation

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Ducts properly installed without compression and appropriately supported

Ducts properly installed without compression and appropriately supported
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Ducts properly installed without compression and appropriately supported

Ducts properly installed without compression and appropriately supported
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Ducts running parallel to trusses have limited width due to truss spacing

Ducts running parallel to trusses have limited width due to truss spacing
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Ducts sagging because supports not installed at regular intervals

Ducts sagging because supports not installed at regular intervals
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Ducts should not be located in exterior wall cavities

Ducts should not be located in exterior wall cavities
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Ducts well supported

Ducts well supported
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Ducts well supported

Ducts well supported
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Ducts well supported

Ducts well supported
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Ducts well supported by framing and straps as needed

Ducts well supported by framing and straps as needed
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Ductwork in an unvented attic

Ductwork in an unvented attic
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Ductwork located in a vented attic is subject to high attic temperatures and significant heat gain through the walls of the ducts

Ductwork located in a vented attic is subject to high attic temperatures and significant heat gain through the walls of the ducts
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Ductwork, like this insulated flex duct, penetrates the subfloor where there are floor registers on the floor above.

Ductwork, like this insulated flex duct, penetrates the subfloor where there are floor registers on the floor above
Case Study:

Eaglesprings and Waterhaven Communities

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Electronically controlled dampers allow this central air system to provide zoned heating and cooling to specific parts of the home.

Electronically controlled dampers allow this central air system to provide zoned heating and cooling to specific parts of the home.