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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.
A duct leakage test is performed on a ducted heat pump system using a duct tester (blower fan) and a digital manometer.
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
Air handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities
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
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
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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
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
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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
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
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
Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
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Cavity was not air sealed
Cavity was not air sealed
Cavity was not air sealed
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Compact duct design layout
Compact duct design layout
Compact duct design layout
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Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
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
Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
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Cut the duct to the length needed
Cut the duct to the length needed
Cut the duct to the length needed
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Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
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Door is not undercut therefore not contributing to pressure balancing
Door is not undercut therefore not contributing to pressure balancing
Door is not undercut therefore not contributing to pressure balancing
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Drywall is installed, hiding the duct work
Drywall is installed, hiding the duct work
Drywall is installed, hiding the duct work
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Duct is compressed
Duct is compressed
Duct is compressed
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Duct is compressed
Duct is compressed
Duct is compressed
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Duct is kinked in cavity
Duct is kinked in cavity
Duct is kinked in cavity
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Duct is run straight and supported properly
Duct is run straight and supported properly
Duct is run straight and supported properly
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Duct is run straight and supported properly
Duct is run straight and supported properly
Duct is run straight and supported properly
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Duct to boot connection of jump duct is properly sealed with mastic
Duct to boot connection of jump duct is properly sealed with mastic
Duct to boot connection of jump duct is properly sealed with mastic
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Duct to boot connection of jump duct not fastened and sealed
Duct to boot connection of jump duct not fastened and sealed
Duct to boot connection of jump duct not fastened and sealed
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Ducts are run straight and supported properly
Ducts are run straight and supported properly
Ducts are run straight and supported properly
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Ducts crammed into cavity, kinked and sharply bent
Ducts crammed into cavity, kinked and sharply bent
Ducts crammed into cavity, kinked and sharply bent
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Ducts properly installed without compression and appropriately supported
Ducts properly installed without compression and appropriately supported
Ducts properly installed without compression and appropriately supported
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Ducts properly installed without compression and appropriately supported
Ducts properly installed without compression and appropriately supported
Ducts properly installed without compression and appropriately supported
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Ducts sagging because supports not installed at regular intervals
Ducts sagging because supports not installed at regular intervals
Ducts sagging because supports not installed at regular intervals
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Ducts should not be located in exterior wall cavities
Ducts should not be located in exterior wall cavities
Ducts should not be located in exterior wall cavities
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Ducts well supported
Ducts well supported
Ducts well supported
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Ducts well supported
Ducts well supported
Ducts well supported
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Ducts well supported
Ducts well supported
Ducts well supported
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Ducts well supported by framing and straps as needed
Ducts well supported by framing and straps as needed
Ducts well supported by framing and straps as needed
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Ensure that the air handler location does not conflict with duct routing
Ensure that the air handler location does not conflict with duct routing
Ensure that the air handler location does not conflict with duct routing
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Example of an HVAC installer’s balancing report form
Example of an HVAC installer’s balancing report form
Example of an HVAC installer’s balancing report form
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Excessive length of duct installed
Excessive length of duct installed
Excessive length of duct installed
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Excessive length of duct installed causing sharp bends
Excessive length of duct installed causing sharp bends
Excessive length of duct installed causing sharp bends
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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
Fan housing was oriented in the correct direction to allow proper exhaust duct installation
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Flex duct compressed by plumbing pipes
Flex duct compressed by plumbing pipes
Flex duct compressed by plumbing pipes
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Flex ducts are compressed
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
Flex ducts may rest on ceiling joists or truss supports
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Flexible Duct Materials & Assembly
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
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
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
Floor joist cavities can make acceptable duct chases
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Floor joist cavities can make acceptable duct chases
Floor joist cavities can make acceptable duct chases
Floor joist cavities can make acceptable duct chases
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Framing allowed duct work to be properly installed without compression
Framing allowed duct work to be properly installed without compression
Framing allowed duct work to be properly installed without compression
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Grill and duct size based on calculated requirements for net free area
Grill and duct size based on calculated requirements for net free area
Grill and duct size based on calculated requirements for net free area
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Hanger straps should be at least 1.5 inches wide
Hanger straps should be at least 1.5 inches wide
Hanger straps should be at least 1.5 inches wide
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HVAC duct layout
HVAC duct layout
HVAC duct layout
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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
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
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
If a dropped soffit is used to house a duct, the soffit space must equal the duct diameter plus the insulation thickness
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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