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Lay out duct so that no radius of a bend or turn is less than the diameter of the airway
Leaks at the air filter cover panel can draw in unconditioned or undesirable air
Locate the fresh air intake away from pollution sources and in an easily accessible location
Mechanical damper installed
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
Provide for pressure balancing between bedrooms and the rest of the house.
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
Recessed can light is compressing duct work
RESNET Grade I installation of spray foam insulation
Return box has been properly sealed with mastic
Return box has not been sealed
Return duct has been properly sealed with mastic
Return has not been sealed
Right - Baffles are installed in attic to keep blown insulation from blocking soffit vents and ventilation path
Right - Batt was properly split around wires to achieve RESNET Grade I
Right – HVAC furnace filter is properly installed in cabinet with gasketed cover to prevent air leakage
Right – RESNET grade I installation of batt insulation
Right – RESNET Grade I installation of blown insulation
Right-- IR photo shows how effectively spray foam insulated/air sealed attic kneewall and the floor cavities under kneewall
The polyethylene ground cover for this insulated crawlspace is taped at seams and around posts before the insulation and slab are installed.
Rigid foam forms an insulating bond break between the foundation wall and the slab
Rigid foam slab edge insulation is installed along the exterior edge of a monolithic slab foundation
Run-out ducts are installed over partition walls
Size the filter box for the appropriate filter
Some builders create pan joists by attaching a solid sheet good to the bottom of a floor joist to create a return air pathway
Spray foam insulation is installed in open wall cavities to air seal and insulate
Spray foam is installed between new studs over the existing siding in this deep energy retrofit
Straps are spaced too far apart causing the straps to compress the duct under its own weight
The drywall above the dropped ceiling duct chase extends beyond adjoining top plates for a continuous air barrier
There should be less than 2.5 inches per each five foot of duct length
To increase surface area and reduce pressure drop for high MERV filters, the return duct can be constructed to permit the installation of two furnace filters side by side
Transfer grill not sealed
Transfer grill sealed with mastic
Twisting and compressing flex duct will block air flow
Unfaced fiberglass batt insulation is installed to completely fill the wall cavities and is sliced to fit around wiring, piping, and other obstructions in the wall cavities
Well sealed duct lifted into raised ceiling chase
When installing piping and wiring, do not block access to the filter
Wrong - Batt insulation installed backward
Wrong  - Cavity insulation not installed properly
Wrong - Cavity insulation not installed properly
Wrong - Cavity insulation not installed properly