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Ducts should not be located in exterior wall cavities
Courtesy Of: Calcs Plus
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Form a sheet metal shield around the flue pipe
Reference: Guide to Attic Air Sealing
Author(s): Lstiburek
Organization(s): Building Science Corporation

Fact sheet providing detailed information about air sealing attics.

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Form sheet metal shield around pipe keeping 3-inch clearance
Reference: Guide to Attic Air Sealing
Author(s): Lstiburek
Organization(s): Building Science Corporation

Fact sheet providing detailed information about air sealing attics.

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HVAC ducts, cavities used as ducts, and combustion inlets and outlets may pass perpendicularly through exterior walls but shall not be run within exterior walls unless at least R-6 continuous insulation is provided on exterior side of the cavity
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If HVAC duct must be installed in an exterior wall, separate it from the exterior with at least R-6 of continuous rigid insulation
Courtesy Of: Calcs Plus
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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
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Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
Courtesy Of: Calcs Plus
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Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Reference: Guide to Attic Air Sealing
Author(s): Lstiburek
Organization(s): Building Science Corporation

Fact sheet providing detailed information about air sealing attics.

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No insulation installed in cavity and not air sealed
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Courtesy Of: BA-PIRC
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Reference: Summary of Interior Ducts in New Construction, Including an Efficient, Affordable Method to Install Fur-Down Interior Ducts
Author(s): Beal, McIlvaine, Fonorow, Martin
Organization(s): BA-PIRC, National Renewable Energy Laboratory, Florida Solar Energy Center, FSEC

Document illustrating guidelines for efficient installation of interior duct systems in new housing.

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Courtesy Of: BA-PIRC
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Courtesy Of: BA-PIRC
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Courtesy Of: FSEC
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Reference: Investigation of Potential Benefits of Revising Exception 1 under “FLORIDA BUILDING CODE, ENERGY CONSERVATION, Section 101.4.7.1.1 Duct Sealing upon Equipment Replacement.”
Author(s): McIlvaine, Beal
Organization(s): FSEC

Report describing as-found interior platform return plenums, the magnitude of their contribution to the total amount of duct leakage, and techniques and results of retrofits executed by the HVAC trade during equipment replacement.

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Reference: Investigation of Potential Benefits of Revising Exception 1 under “FLORIDA BUILDING CODE, ENERGY CONSERVATION, Section 101.4.7.1.1 Duct Sealing upon Equipment Replacement.”
Author(s): McIlvaine, Beal
Organization(s): FSEC

Report describing as-found interior platform return plenums, the magnitude of their contribution to the total amount of duct leakage, and techniques and results of retrofits executed by the HVAC trade during equipment replacement.

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Courtesy Of: BA-PIRC
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Courtesy Of: FSEC
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Courtesy Of: FSEC
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