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A complete HVAC system includes ducted returns
A ducted central return brings air from central return registers back to the air handler through insulated, air-sealed ducts
A heat recovery ventilator supplies all living spaces with fresh air while transferring heat for energy savings.
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.
A nylon draw band and tensioning tool are used to secure the inner coil of the pre-insulated flexible duct
A nylon draw band and tensioning tool are used to secure the inner liner of the pre-insulated flexible duct
A rigid metal duct vents the exhaust fan.
A second layer of rigid insulation is installed over the 2 in. by 4 in. retaining strip
A technician conducts a duct blaster test
A triple-filtered energy recovery ventilator is installed with individual supply ducts to provide fresh air to each room.
After securing the inner coil, cover the draw band and the seam with a generous amount of mastic
Air handler platforms used as return air plenums can draw air from vented attics and crawlspaces through other connected framing cavities
Air seal and insulate flex ducts
Air seal around all duct shafts and flues installed through ceilings, walls, or flooring to keep conditioned air from leaking into unconditioned space.
All of the ductwork for the efficient (8.5 HSPF, 15 SEER) heat pump is mastic sealed and installed in conditioned space.
All other supply ducts and all return ducts in unconditioned space have insulation ≥ R-6
An energy recovery ventilator provides filtered fresh air to every room in the house.
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.
Assembled section of fiber board duct
Back-draft damper still has a piece of tape that prevented it from rattling during shipping
Because this ICF and spray foamed house is so well insulated, the HVAC system is smaller, the round metal ducts are smaller diameter, and the duct layout is more compact.
Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
Bedrooms pressure-balanced and provide 1 sq. in. of free area opening per 1 CFM of supply air or achieve a Rater-measured pressure differential ≤ 3 Pa
Boot has been covered with insulation and sealed with mastic
Boot has been covered with insulation and sealed with mastic
Boot is uninsulated
Boot to drywall connection not sealed
Boot to drywall connection sealed
Boot to floor connection not sealed
Boot to floor connection sealed
Building cavities not used as supply or return ducts unless they meet Items 3.2, 3.3, 4.1, and 4.2 of this Checklist
Cavity used for return is not insulated and is not air sealed, which will pull in air from outside
Cavity was not air sealed
Closed-cell spray foam covers the heat recovery ventilator ducts and also seals all top plates and seams in the ceiling drywall of the vented attic.
Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
Common exhaust duct not shared by fans in separate dwellings
Compact duct design layout
Example of a compact duct layout showing a centrally located furnace (FAU)
Connection in place but not sealed
Consider using a metal duct elbow instead of flex duct at boot connections to prevent compressions
Coordinate with other trades including framers, plumbers, and electricians to prevent needless looping of flex duct
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
Cut the duct to the length needed
Door has been undercut to allow for specified amount of air flow therefore contributing to pressure balancing
Door is not undercut therefore not contributing to pressure balancing
Drywall is installed as an air barrier above the central hallway duct chase prior to installing the trunk ducts.
Drywall is installed before framing in dropped soffits to provide an air barrier above these duct chases.
Drywall was installed before installing the duct chase to ensure the ducts will be separated from the attic.
Duct boots sealed to floor, wall or ceiling using caulk, foam, mastic tape or mastic paste
Duct insulation is installed over boot
Duct insulation is installed over boot
Duct is compressed
Duct is compressed
Duct is kinked in cavity
Duct is located in unconditioned space and is not insulated
Duct is located in unconditioned space and is properly insulated
Duct is run straight and supoprted properly
Duct is run straight and supported properly
Duct to boot connection of jump duct is properly sealed with mastic
Duct to boot connection of jump duct not fastened and sealed
Duct work is uninsulated and not sealed at seams
Ducts are insulated but strapping is compressing the insulation therefore reducing the R-value
Ducts are properly insulated and supported without compressing the insulation
Ducts are run straight and supported properly
Ducts crammed into cavity, kinked and sharply bent
Ducts properly installed without compression and appropriately supported
Ducts properly installed without compression and appropriately supported
Ducts running parallel to trusses have limited width due to truss spacing
Ducts sagging because supports not installed at regular intervals
Ducts should not be located in exterior wall cavities
Ducts well supported
Ducts well supported
Ducts well supported
Ducts well supported by framing and straps as needed
Electronically controlled dampers allow this central air system to provide zoned heating and cooling to specific parts of the home.
Ensure that the air handler location does not conflict with duct routing

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