Showing results 1 - 94 of 94
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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 duct boot to ceiling by installing fiberglass mesh tape and mastic over seam
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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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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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Non-hardening removable putty can be used to seal around wiring holes in the HVAC cabinet
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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 - An EPDM gasket is installed around an HRV duct installed in an exterior wall; 9 of 14.
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Right - Ducts and heat pump cabinet are properly sealed with mastic, high MERV filter is installed, and duct and refrigerant lines are air sealed at ceiling.
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Right - Insulating sleeve for small through-the-wall HRV unit with sealing gasket; 3 of 14.
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Right – All of the cabinet seams in this HVAC air furnace are sealed with an approved metal tape.
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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: 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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Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic
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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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Ventilation air comes directly from outdoors, not from adjacent dwelling units, garages, crawlspaces, or attics
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When architects and builders think of the house as a systems, all of the parts are designed to work together for a healthy, durable home that minimizes builder callbacks while cutting energy, maintenance, and repair costs down the road.
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Wrong - Duct seams were sealed with regular duct tape which has failed to hold; seams should have been sealed with mastic or approved metal tape.
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Wrong - Flex duct insulation is overly compressed in 3 ways; Zip-tie fastener is over the insualtion not under the insulation at the duct boot collar, duct turning radius is too tight, and support strap is too tight.
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Wrong - HVAC rigid metal duct seam needs to be air sealed with mastic or metal tape.
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Wrong - Metal tape is poorly adhered and metal duct and duct-to-subfloor seam is not sealed.
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Wrong - Penetrations in walls for ducts should be air sealed to reduce air leakage.
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Wrong - The seam around the duct boot where the duct boot enters the trunk duct has not been completely sealed with mesh tape and mastic.
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Wrong – Duct is pulling away from ceiling because it is not sealed to the ceiling
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Wrong- A tie strap should not be used over the duct outer liner because it can compress the insulation. Tuck in the fibrous insulation and seal the outer liner to the connecting duct with mastic or foil tape (Steven Winter Associates 2013).
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Wrong: Open wall cavities in the un-air-sealed return plenum connect the plenum to attic spaces
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Wrong: open wall cavity connected to this return air plenum is allowing cellulose attic insulation to be pulled into the furnace
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Wrong: The door and filter were removed, allowing unfiltered air to enter the air handler leading to premature failure of the system due to dirt accumulation.
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Wrong: The return plenum is not air sealed to separate it from the wall cavities and it should not be used for storage
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Wrong: This return air plenum is not lined and air sealed
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Wrong: This wall cavity is open to the attic allowing unconditioned, attic air to enter the HVAC system, bypassing the filter, and degrading system life and performance