Showing results 51 - 90 of 90
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If airflow must be limited to a supply register, use balancing dampers at the trunk line rather than looping duct to control airflow
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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 bottom layer of rigid insulation
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Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
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Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
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Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
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Lay out duct so that no radius of a bend or turn is less than the diameter of the airway
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Open floor trusses used as return air plenums can draw air from any place connected to that floor
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Pulling flex duct taut when installing greatly reduces the amount of friction caused by the ducting
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R-6 flexible duct has 2 inches of insulation around the inner liner so a 12-inch duct requires a 16x16-inch chase
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Right – Flex ducts are properly supported with straps that don’t pinch the insulation; closed-cell spray foam will be applied to the underside of the roof deck of this hot-humid climate home to provide an insulated attic space for the HVAC ducts.
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Run-out ducts are installed over partition walls
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Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway
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Straps are spaced too far apart causing the straps to compress the duct under its own weight
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The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier
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Well sealed duct lifted into raised ceiling chase
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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.