Showing results 51 - 94 of 94
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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