Showing results 1 - 19 of 19
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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
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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
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Right - A hand saw is used to remove wall material for a small through-the-wall HRV; 6 of 14.
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Right - A hole is drilled into the wall for installation small through-the-wall HRV; 5 of 14.
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Right - A small through-the-wall HRV duct is installed in an exterior wall; 7 of 14.
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Right - An EPDM gasket is installed around an HRV duct installed in an exterior wall; 9 of 14.
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Right - Flaps are cut into house wrap installed over an HRV duct then taped out of the way to install flashing; 8 of 14.
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Wrong: Open wall cavities in the un-air-sealed return plenum connect the plenum to attic spaces
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Wrong: open wall cavity connected to this return air plenum is allowing cellulose attic insulation to be pulled into the furnace
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Wrong: The return plenum is not air sealed to separate it from the wall cavities and it should not be used for storage
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Wrong: This return air plenum is not lined and air sealed
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Wrong: This wall cavity is open to the attic allowing unconditioned, attic air to enter the HVAC system, bypassing the filter, and degrading system life and performance