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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
All ceiling, wall, floor, and slab insulation shall achieve RESNET-defined Grade I installation
Batt insulation should be cut to fit around wiring so that insulation can completely fill the wall cavity
Batt was properly split around wires to achieve RESNET Grade I
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
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
Blown cellulose insulation completely fills the netted wall and ceiling cavities
Blown fiberglass insulation fills netted wall cavities
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
Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
Cavity was not air sealed
Ceiling, wall, floor, and slab insulation levels shall meet or exceed Builders Challenge levels
Compact duct design layout
Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
Cut the duct to the length needed
Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
Door is not undercut therefore not contributing to pressure balancing
Duct is compressed
Duct is compressed
Duct is kinked in cavity
Duct is run straight and supoprted properly
Duct is run straight and supported properly
Duct to boot connection of jump duct is properly sealed with mastic
Duct to boot connection of jump duct not fastened and sealed
Ducts are run straight and supported properly
Ducts crammed into cavity, kinked and sharply bent
Ducts properly installed without compression and appropriately supported
Ducts properly installed without compression and appropriately supported
Ducts sagging because supports not installed at regular intervals
Ducts should not be located in exterior wall cavities
Ducts well supported
Ducts well supported
Ducts well supported
Ducts well supported by framing and straps as needed
Ensure that the air handler location does not conflict with duct routing
Example of an HVAC installer’s balancing report form
Excessive length of duct installed
Excessive length of duct installed causing sharp bends
Excessive length of duct installed causing sharp bends
Expanded polystyrene insulation is installed with joints taped and lath attached in preparation for the application of stucco. Windows are flashed to the drainage plane (not seen), which is behind the insulation.
Faced fiberglass batt insulation can be stapled to the stud faces or slightly inset, but avoid compressing the batts
Faced fiberglass batt insulation incorrectly installed
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
Flex duct compressed by plumbing pipes
Flex ducts are compressed
Flex ducts may rest on ceiling joists or truss supports
Flexible Duct Materials & Assembly
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 supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
Floor joist cavities can make acceptable duct chases
Floor joist cavities can make acceptable duct chases
Framing allowed duct work to be properly installed without compression
Grill and duct size based on calculated requirements for net free area
Hanger straps should be at least 1.5 inches wide
HVAC duct layout
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
Identify what materials will constitute the continuous air barrier around the building envelope.
If a dropped soffit is used to house a duct, the soffit space must equal the duct diameter plus the insulation thickness
If airflow must be limited to a supply register, use balancing dampers at the trunk line rather than looping duct to control airflow
If filter is inaccessible, locate the air filter between the return air plenum and the air handler box
If furnace is accessible, locate the air filter between the return air plenum and the air handler box
If HVAC duct must be installed in an exterior wall, separate it from the exterior with at least R-6 of continuous rigid insulation
If the furnace is hard to access, locate filters at return registers covered by hinged grilles that are easy to open from inside the home
If wall registers are desired, install HVAC ducts in interior wall cavities
Inadequate amount of insulation installed with compression, misalignment, and voids
Install an access panel cover with a gasket and duct tape the edges
Install bottom layer of rigid insulation
Install ducts without excessive coils or loops
Install ducts without kinks or sharp bends
Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
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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