Showing results 1 - 90 of 90
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A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.
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Air handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities
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Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
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Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
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Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist
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Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
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Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
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Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
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Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
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Duct to boot connection of jump duct not fastened and sealed
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Ducts sagging because supports not installed at regular intervals
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Example of an HVAC installer’s balancing report form
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Fan housing was oriented in the correct direction to allow proper exhaust duct installation
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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
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Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
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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 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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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.