Showing results 1 - 100 of 229
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A constant airflow regulator is a modulating orifice that automatically regulates airflows in duct systems to constant levels
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A constant airflow regulator is fitted into the neck of the supply duct to control air flow to deliver the design airflow regardless of pressure variations
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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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A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts
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A nylon draw band and tensioning tool are used to secure the inner coil of the pre-insulated flexible duct
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A nylon draw band and tensioning tool are used to secure the inner liner of the pre-insulated flexible duct
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A technician assembles the spray sealant injection system to seal HVAC ducts from the inside
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After securing the inner coil, cover the draw band and the seam with a generous amount of mastic
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Air seal and insulate flex ducts
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Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam
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All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
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Back-draft damper still has a piece of tape that prevented it from rattling during shipping
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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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Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
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Connect the plastic application tunnel from the injection equipment to the supply plenum.
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Cut fiber board with a red V-groove tool and a gray shiplap tool to create mitered corners and a shiplapped edge for duct sections
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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 boot is air sealed to ceiling by covering the seam with fiberglass mesh tape and mastic
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Duct boots sealed to floor, wall, or ceiling using caulk, foam, mastic tape, or mastic paste
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Duct lacks adequate support to carry the weight so the few straps are pinching the duct
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Duct to boot connection of jump duct not fastened and sealed
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Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value
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Ducts sagging because supports not installed at regular intervals
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Electronically controlled dampers allow this central air system to provide zoned heating and cooling to specific parts of the home.
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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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Fans from seperate dwellings exhausted together without back-draft dampers and not sealed
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Fiberglass mesh tape is installed around a duct boot in preparation for air sealing with mastic
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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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Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools
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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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Manual D details show duct size and chase path
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