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Duct insulated with a minimum of R-8 insulation

Duct insulated with a minimum of R-8 insulation

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Duct and HVAC Insulation

Reference

Information sheet with HVAC duct insulation, testing, maintenance and performance information.

Ducts are properly insulated and supported without compressing the insulation

Ducts are properly insulated and supported without compressing the insulation

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The duct for this exhaust fan is properly routed through the roof and the duct is insulated

The duct for this exhaust fan is properly routed through the roof and the duct is insulated

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Air seal and insulate flex ducts

Air seal and insulate flex ducts

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Duct insulation is installed over boot

Duct insulation is installed over boot

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Duct is located in unconditioned space and is not insulated

Duct is located in unconditioned space and is not insulated

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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 – Insulation should not be pinched where flex ducts connect to the trunk duct as compression of the insulation here can lead to cold spots and condensation on the duct surface.

Wrong – Insulation should not be pinched where flex ducts connect to the trunk duct as compression of the insulation here can lead to cold spots and condensation on the duct surface.

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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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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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Cleaning Fibrous Glass Insulated Duct (Ductboard / Duct Board) Systems - Recommended Practices

Reference

Manual showing duct cleaning contractors how to identify the different types of insulated air ducts, how to open each type for access by cleaning equipment and personnel, how to close and seal openings after cleaning.

Duct is located in unconditioned space and is properly insulated

Duct is located in unconditioned space and is properly insulated

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Wrong: Insulation not fully enclosing duct chase

Wrong: Insulation not fully enclosing duct chase

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The jump duct should be insulated and sealed at registers

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Right – Batt insulation provides additional insulation for the home’s main duct chase.

Right – Batt insulation provides additional insulation for the home’s main duct chase.

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All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6

All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6

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Measure Guideline: Sealing and Insulating Ducts in Existing Homes

Reference

Report describing the sealing and insulating of HVAC duct systems in existing homes.

Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6

Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6

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Wrong: Ductwork is not fully encapsulated with ccSPF insulation. The duct jacket is still fully visible at sections of the duct

Wrong: Ductwork is not fully encapsulated with ccSPF insulation. The duct jacket is still fully visible at sections of the duct

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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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Spray foam insulation used for raised ceiling duct chase

Spray foam insulation used for raised ceiling duct chase

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Spray foam insulation used for raised ceiling duct chase.

Spray foam insulation used for raised ceiling duct chase.

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If a dropped soffit is used to house a duct, the soffit space must equal the duct diameter plus the insulation thickness

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The attic duct chase insulated and sealed to the attic floor with spray foam

The attic duct chase insulated and sealed to the attic floor with spray foam

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Trunk to duct connections are properly insulated and have been sealed with mastic

Trunk to duct connections are properly insulated and have been sealed with mastic

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Right: Ducts are completely buried beneath insulation to the depth specified in the plans

Right: Ducts are completely buried beneath insulation to the depth specified in the plans

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Knauf Insulation Air Duct Fabrication Manual for 1", 1-1/2", and 2"

Reference

Website providing information about Knauf Insulation.

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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Rigid foam was used to insulate this return plenum attached to this flex duct.

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