Showing results 1 - 100 of 132
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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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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 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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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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Cut-away view showing unsealed gaps around a heating duct that goes through a wall
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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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Fiberglass mesh tape is installed around a duct boot in preparation for air sealing with mastic
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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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Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
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Plan view of duct or pipe penetration through exterior wall showing flashing and air sealing details
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Prepare chase with adhesive for bottom insulation
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Raised ceiling chase sealed with drywall mud
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Rater-measured duct leakage to outdoors ≤ 4 CFM25 per 100 sq. ft. of conditioned floor area
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Right - The duct shows redundant sealing including the caulk, tape, and flashing
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Right - This duct penetration is properly flashed and integrated with the taped, foil-faced foam sheathing layer, which serves as the air and water barrier
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Right – A contractor installs mastic in branch duct take offs to air seal the seams where they attach to the trunk duct.
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Right – Chase capped with rigid air barrier and duct work penetrations properly sealed
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Right – Flex duct is properly connected to metal duct with a duct tie and connection is mastic sealed
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Right – Metal or fiberboard duct is mastic sealed at junction with duct register box
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Right – The hard metal ducts are located in conditioned space between floor joists and all seams are sealed with approved metal tape.
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Right – This supply duct is thoroughly sealed at all joints with mastic to prevent air leakage and the duct is equipped with a damper to provide zoned heating and cooling along with other trunk ducts.
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Right: A well-constructed air handler closet
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Right: Air seal all seams in the return air plenum before installing a new air handler
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Right: Refrigerant piping is sealed where it exits the return plenum
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Right: Spray foam air seals and insulates raised ceiling duct chase
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Right: The bottom of the air handler cabinet is well sealed to the return platform
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Right: The plenum liner is well sealed to the filter-backed grille
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Right: Use mastic to air seal the return air plenum and to seal around refrigerant lines coming from the slab in the floor of the return
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Run-out duct is sealed with mastic
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Seal all wood framing joints surrounding the chase with sealant and lay a bead of sealant along top edge of chase framing
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Seal all wood framing joints surrounding the chase with sealant and lay a bead of sealant on top edge of chase framing
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Seal bottom layer of rigid insulation with adhesive, tape and nails
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Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic
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Second layer of rigid insulation is adhered with foam
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Spray foam insulation used for raised ceiling duct chase
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Spray foam insulation used for raised ceiling duct chase.
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The duct sealing spray injection system application tunnel inflates as the injection system operates
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The duct sealing spray injection system includes a blower/heater (background) and the sealant injection unit (foreground)
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This typical dropped ceiling hallway chase shows a complicated air sealing scheme where chase ceiling drywall meets sidewall top plates
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To prepare for a total duct test at final, cover all of the supply outlets and return inlets
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To prepare for a total duct test at rough-in, cover all of the supply outlets and return inlets
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Use masking tape as a removable sealer to stop air from leaking around the return grille filter.
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