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Exhaust fan ducts should be made of rigid metal ducting not flexible corrugated ducts like these and the ducts should be attached to the roof or soffit to vent completely to the outside not left open in the attic near an attic vent

Exhaust fan ducts should be made of rigid metal ducting not flexible corrugated ducts like these and the ducts should be attached to the roof or soffit to vent completely to the outside not left open in the attic near an attic vent
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Exhaust fans in separate dwelling units should not share a common exhaust

Exhaust fans in separate dwelling units should not share a common exhaust
Case Study:

Existing Whole-House Solutions Case Study: Conway Street Apartments - Greenfield, Massachusetts

Case Study:

Existing Whole-House Solutions Case Study: Deep Energy Retrofit in the Pacific Northwest

Case Study:

Existing Whole-House Solutions Case Study: Inverted Attic Bulkhead for HVAC Ductwork, Roseville, California

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Faced fiberglass batt insulation can be stapled to the stud faces or slightly inset, but avoid compressing the batts

Faced fiberglass batt insulation can be stapled to the stud faces or slightly inset, but avoid compressing the batts
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Faced fiberglass batt insulation incorrectly installed

Faced fiberglass batt insulation incorrectly installed
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Fan housing was oriented in the correct direction to allow proper exhaust duct installation

Fan housing was oriented in the correct direction to allow proper exhaust duct installation
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Fan shares exhaust and does not have dack-draft damper installed

Fan shares exhaust and does not have dack-draft damper installed
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Fan shares exhaust and has a back-draft damper installed

Fan shares exhaust and has a back-draft damper installed
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Fans from seperate dwellings exhausted together without back-draft dampers and not sealed

Fans from seperate dwellings exhausted together without back-draft dampers and not sealed
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Fiber board sheets are available with pre-cut shiplapped ends

Fiber board sheets are available with pre-cut shiplapped ends
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Fiberglass duct board typically comes in sheets 4 foot wide by 10 foot long

Fiberglass duct board typically comes in sheets 4 foot wide by 10 foot long
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Fiberglass insulation stuffed into the large hole around this HVAC duct won't prevent air leakage from the unconditioned basement to the conditioned space above; the large gap should be sealed with a rigid air barrier and caulked or spray foamed.

The fiberglass insulation stuffed into the large hole around this HVAC duct will not prevent air leakage from the unconditioned basement to the conditioned space above; the large gap should be sealed with a rigid air barrier and caulked or spray foamed.
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Fiberglass mesh tape is installed around a duct boot in preparation for air sealing with mastic

Fiberglass mesh tape is installed around a duct boot in preparation for air sealing with mastic
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Fiberglass mesh tape is installed around a duct boot in preparation for air-sealing the seams with mastic.

Fiberglass mesh tape is installed around a duct boot in preparation for air-sealing the seams with mastic.
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Finished raised ceiling duct chase

Finished raised ceiling duct chase
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Flex duct compressed by plumbing pipes

Flex duct compressed by plumbing pipes
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Flex ducts are compressed

Flex ducts are compressed
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Flex ducts may rest on ceiling joists or truss supports

Flex ducts may rest on ceiling joists or truss supports
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Flexible Duct Materials & Assembly

Flexible Duct Materials & Assembly
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Flexible ducts in unconditioned space not installed in cavities smaller than outer duct diameter; in conditioned space not installed in cavities smaller than inner duct diameter

Flexible ducts in unconditioned space not installed in cavities smaller than outer duct diameter; in conditioned space not installed in cavities smaller than inner duct diameter
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Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft

Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
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Floor joist cavities can make acceptable duct chases

Floor joist cavities can make acceptable duct chases