Showing results 101 - 200 of 422
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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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Finished raised ceiling duct chase
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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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Fresh air intakes and exhaust vents are ducted to each unit in this multifamily building
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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 can be encapsulated in 3 inches of closed-cell spray foam, then buried in R-49 of blown fiberglass insulation after the ceiling drywall is installed in the vented attic.
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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 a dropped soffit is used to house a duct, the soffit space must equal the duct diameter plus the insulation thickness
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If airflow must be limited to a supply register, use balancing dampers at the trunk line rather than looping duct to control airflow
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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 bottom layer of rigid insulation
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Install duct supports in line with ceiling trusses
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Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
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Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
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Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
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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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Jump ducts are installed in the ceiling to connect closed rooms with open space to provide a return air path and balance air pressure
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Lay out duct so that no radius of a bend or turn is less than the diameter of the airway
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Manual D details show duct size and chase path
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Open floor trusses used as return air plenums can draw air from any place connected to that floor
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Open-web floor joists provide space for ducts between the floors of a two-story home.
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Packing tape has been removed and damper will be able to function properly once fan is installed
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Pan stock is used to form a boot for future register installation
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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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Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6
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Pull the insulation and outer liner of the flex duct over the collar to come in full contact with the liner and insulation of the trunk line or fitting and tape in place
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Pulling flex duct taut when installing greatly reduces the amount of friction caused by the ducting
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R-6 flexible duct has 2 inches of insulation around the inner liner so a 12-inch duct requires a 16x16-inch chase
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Raised ceiling chase sealed with drywall mud
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Raised ceiling duct chase is not visible as finished product
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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 - a dropped ceiling below a taped plywood air barrier provides a service cavity for ducts and wiring.
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Right - A heat recovery ventilator supplies all living spaces with fresh air while transferring heat for energy savings.
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Right - A high-efficiency (95 AFUE) wall-hung gas-fired boiler heats water for the hydro-coil space heating system and also provides a back-up for the solar hot water system.
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Right - All seams in the HVAC equipment and ductwork are sealed with mastic; because the HVAC equipment is in the garage, it is an air-sealed closet.
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Right - An in-line air flow testing station is installed in a straight section of smooth metal duct (red outline) to determine the air flow rate of a fresh air intake for a whole house ventilation system.
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Right - An ultra-efficient (COP 5.7) ground source heat pump provides hot water to an air coil in the central air handler which uses a variable-speed electrically commutated fan motor to distribute conditioned air to the home’s ducts.
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Right - Drywall was installed before installing the duct chase to ensure the ducts will be separated from the attic.
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Right - Flex duct installed with adequate support and pulled taut to provide adequate air flow
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Right - Flex duct installed with frequent supports, straight runs, and gradual turns to allow good air flow
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Right - HVAC ducts should be well-supported with minimal bends and pinching.
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Right - Open-cell polyurethane spray foam to R-28 on underside of roof turns new attic into conditioned space for HVAC.
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Right - Straps are spaced close enough together to provide adequate support of the flex duct
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Right - The butterfly damper of this crawlspace supply register opens when the HVAC fan is running; the damper duct is sealed with mastic and supported by strapping.
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Right - The duct shows redundant sealing including the caulk, tape, and flashing
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Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.
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Right - The kitchen exhaust duct termination is integrated aesthetically and functionally with the exterior cladding; however, the opening should be screened to keep out pests.
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