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Fan housing was oriented in the correct direction to allow proper exhaust duct installation
Fan housing was oriented in the correct direction to allow proper exhaust duct installation
Fan shares exhaust and does not have dack-draft damper installed
Fan shares exhaust and has a back-draft damper installed
Fans from seperate dwellings exhausted together without back-draft dampers and not sealed
Fiber board sheets are available with pre-cut shiplapped ends
Fiberglass duct board typically comes in sheets 4 foot wide by 10 foot long
Finished raised ceiling duct chase
Flex duct compressed by plumbing pipes
Flex ducts are compressed
Flex ducts may rest on ceiling joists or truss supports
Flexible Duct Materials & Assembly
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
Flexible ducts supported at intervals as recommended by mfr. but at a distance ≤ 5 ft
Floor joist cavities can make acceptable duct chases
Floor joist cavities can make acceptable duct chases
Form a sheet metal shield around the flue pipe
Form sheet metal shield around pipe keeping 3-inch clearance
Framing allowed duct work to be properly installed without compression
Grill and duct size based on calculated requirements for net free area
Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools
Hanger straps should be at least 1.5 inches wide
HVAC duct layout
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.
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
If a dropped soffit is used to house a duct, the soffit space must equal the duct diameter plus the insulation thickness
If airflow must be limited to a supply register, use balancing dampers at the trunk line rather than looping duct to control airflow
If HVAC duct must be installed in an exterior wall, separate it from the exterior with at least R-6 of continuous rigid insulation
If wall registers are desired, install HVAC ducts in interior wall cavities
Inadequate amount of insulation installed with compression, misalignment, and voids
Install bottom layer of rigid insulation
Install duct supports in line with ceiling trusses
Install ducts without excessive coils or loops
Install ducts without kinks or sharp bends
Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
Install supports every 5 feet so that maximum allowable sag in flexible duct is no more than one-half inch per foot
Install wood framing cross pieces in the attic rafter bays on each side of the duct chase
Insulation does not cover boot and is not sealed
Insulation does not cover boot and is not sealed
Insulation does not cover boot and is not sealed
Jump ducts are installed in the ceiling to connect closed rooms with open space to provide a return air path and balance air pressure
Lay out duct so that no radius of a bend or turn is less than the diameter of the airway
Manual D details show duct size and chase path
Mechanical damper installed
Mechanically fastened and sealed
Metal strap is too small and is compressing duct
Metal strap is too small and is compressing duct
No insulation installed in cavity and not air sealed
No mechanical damper installed
Open floor trusses used as return air plenums can draw air from any place connected to that floor
Open-web floor joists provide space for ducts between the floors of a two-story home.
Packing tape has been removed and damper will be able to function properly once fan is installed
Pan stock is used to form a boot for future register installation
Prepare chase with adhesive for bottom insulation
Prescriptive Path: Supply ducts in unconditioned attic have insulation ≥ R-8. Performance Path: Supply ducts in unconditioned attic have insulation ≥ R-6
Provide for pressure balancing between bedrooms and the rest of the house.
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
Pulling flex duct taut when installing greatly reduces the amount of friction caused by the ducting
R-6 flexible duct has 2 inches of insulation around the inner liner so a 12-inch duct requires a 16x16-inch chase
Raised ceiling chase sealed with drywall mud
Raised ceiling duct chase is not visible as finished product
Rater-measured duct leakage to outdoors ≤ 4 CFM25 per 100 sq. ft. of conditioned floor area
Recessed can light is compressing duct work
Return box has been properly sealed with mastic
Return box has not been sealed
Return duct has been properly sealed with mastic
Return ducts are air sealed with mastic, just like supply ducts
Return has not been sealed
Right - a dropped ceiling below a tape plywood air barrier provides a service cavity for ducts and wiring.
Right - A heat recovery ventilator supplies all living spaces with fresh air while transferring heat for energy savings.
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.
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.
Drywall is installed as an air barrier above the central hallway duct chase prior to installing the trunk ducts.
Right - Drywall was installed before installing the duct chase to ensure the ducts will be separated from the attic.
Right - Flex duct installed with adequate support and pulled taut to provide adequate air flow
Right - Flex duct installed with frequent supports, straight runs, and gradual turns to allow good air flow
Right - Open-cell polyurethane spray foam to R-28 on underside of roof turns new attic into conditioned space for HVAC.
Right - Straps are spaced close enough together to provide adequate support of the flex duct
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.
Right - The ducts are located in conditioned space in open-web joists between the floors and supported to prevent sagging.
Right - The HVAC ducts are located between floors in conditioned space.
Right - The HVAC ducts are located in conditioned space in a dropped hallway ceiling with very short duct runs for more efficient delivery.
Right - The rigid metal HVAC ducting is installed between the floor joists rather than in an unconditioned attic or crawl space to minimize heat loss.
Right - the vapor barrier is extended up the sides of the piers in this crawlspace, which is sealed and insulated to house the HVAC ducts.
Right – A separately ducted HRV supplies fresh air to most rooms in the home.
Right – Batt insulation provides additional insulation for the home’s main duct chase.
Right – Chase capped with rigid air barrier and duct work penetrations properly sealed
Right – Duct register is mastic sealed to framing

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