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Image Gallery

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 technician conducts a duct blaster test
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
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
Collars that are specifically made for flexible duct have a raised bead to prevent the duct from slipping off
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
Ducts should not be located in exterior wall cavities
Fiber board sheets are available with pre-cut shiplapped ends
Fiberglass duct board typically comes in sheets 4 foot wide by 10 foot long
Floor joist cavities can make acceptable duct chases
Floor joist cavities can make acceptable duct chases
Hand tools for cutting fiber board sheets include a knife, straight edge, and color-coded edge-cutting tools
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
Install supply registers in floors or ceilings to avoid routing ducts through exterior walls
Open floor trusses used as return air plenums can draw air from any place connected to that floor
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
Seal all joints and seams in the metal ductwork with mastic before installing insulation
Seal seams in fiber board ducts with out-clinching staples, UL-181A-approved tape, and mastic
Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway
The AC unit has a drip pan and automatic shutoff in case the condensate drain gets clogged.
The duct tester and blower door are set up to measure leakage to the outdoors
The grille in the photo on the left brings air into a return air plenum under an air handler platform. As shown in the infrared image on the right, the plenum is not air sealed so hot attic air is being pulled into the air handler closet.
The high-efficiency air-to-air heat pump is set in an overflow pan with an emergency shut off sensor in case the condensate tube were to clog and cause condensate to fill up the pan.
The precast insulated concrete walls of the basement provide a conditioned space for the high-efficiency (18 SEER, 9.5 HSPF) air-source heat pump, with its variable-speed fan, five-stage compressor, and MERV 11 filter.
The tape is covered with mastic to ensure an airtight seal between the duct and the fitting
This ducted mini-split heat pump was installed in the unvented, conditioned attic and ducted with short duct runs to several nearby rooms.
This home’s ultra-efficient ground-source heat pump provides hot water for space heating as well as domestic hot water for the 50-gallon storage tank.
This utility room houses a high-efficiency gas boiler to provide hot water for the radiant floor heating system and faucets. It also has a central air source heat pump and an energy recovery ventilator.
To attach the flex duct to a main trunk duct or any other connection, the flex duct is pulled over the connecting collar at least 2 inches past the raised bead, then the insulation is pulled back
Two pieces of flex duct are spliced together with a metal sleeve, nylon draw bands, mastic, metal tape, and more mastic
Use only Underwriters Laboratory UL-181 approved tape
When wrapping metal pipes with insulation allow two inches of overlap and staple along the seam with outward clinching staples