Showing results 1 - 100 of 422
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Right - Drywall is installed as an air barrier above the central hallway duct chase prior to installing the trunk ducts.
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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 floor cavity between the first and second floor can provide a conditioned space for HVAC ducts if the rim joists are insulated and air sealed, if sufficient space is available, and if open-web floor joists are used
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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 second layer of rigid insulation is installed over the 2 in. by 4 in. retaining strip
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A technician assembles the spray sealant injection system to seal HVAC ducts from the inside
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A triple-filtered energy recovery ventilator is installed with individual supply ducts to provide fresh air to each room.
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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 handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities
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Air seal a heat pump or air conditioner air handler cabinet at all seams, holes, and junctions
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Air seal all holes and seams in the furnace cabinet with mastic, foil tape, or putty
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Air seal and insulate flex ducts
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Air seal around all duct shafts and flues installed through ceilings, walls, or flooring to keep conditioned air from leaking into unconditioned space.
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Air seal duct boot to ceiling by installing fiberglass mesh tape and mastic over seam
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All of the ductwork for the efficient (8.5 HSPF, 15 SEER) heat pump is mastic sealed and installed in conditioned space.
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All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
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An energy recovery ventilator provides filtered fresh air to every room in the house.
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An in-line airflow station installed in rigid duct provides a location to measure ventilation airflow
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Back-draft damper still has a piece of tape that prevented it from rattling during shipping
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Because this ICF and spray foamed house is so well insulated, the HVAC system is smaller, the round metal ducts are smaller diameter, and the duct layout is more compact.
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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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Buried ducts are laid on the floor of a vented attic then covered with spray foam and blown attic floor insulation
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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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Closed-cell spray foam covers the heat recovery ventilator ducts and also seals all top plates and seams in the ceiling drywall of the vented attic.
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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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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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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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Cut-away view showing unsealed gaps around a heating duct that goes through a wall
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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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Drywall is installed before framing in dropped soffits to provide an air barrier above these duct chases.
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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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Duct/pipe penetration with metal cap flashing and wood blocking for trim attachment
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Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value
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Ducts running parallel to trusses have limited width due to truss spacing
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Ducts sagging because supports not installed at regular intervals
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Ductwork located in a vented attic is subject to high attic temperatures and significant heat gain through the walls of the ducts
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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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