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150 East Highway 67, Suite 210

Duncanville, Texas 75137

Duct Tightness Testing

150 East Highway 67, Suite 210, Duncanville, Texas 75137,
(469) 899-6050
[email protected]
Mon-Fri: 8:00 - 4:00

Duct Tightness Testing

This can be done at rough stage, right after the mechanical rough inspection by the city, or at the final/post-construction. This involves covering the duct ends and connecting to the return duct with our equipment. We then de-pressurize the entire system with our gauge and fan, to see how much leakage there is. The results are based on the number of square feet the system covers, the pressure (25 paschal) and the cubic feet per minute that it leaks. Maximum leakage that is allowed is 4 cubic feet per minute.

Here are the things you need to consider so you can decide when to have it done.

If done at Rough stage, there is easier access to the ducts, boots, plenums and air handlers for correction of missed mastic or taping, and for smoke testing to find any leaks. There is also no wallboard, texture, or paint to get damaged by the grill mask tape. It is also easier for us to trace the duct runs and fresh air intakes or exhausts, and spot problem, since there is more access and more light in the attic spaces. We also do not have to move insulation out of our way.

If done at Final or Post-construction, you must insure that the space between the duct boot and the ceiling or wall it is attached to. We fail half our post-construction tests for this reason alone. Be aware that you will have to have painters in to touch up after we are finished. No matter how careful we try to be, the grill mask tape leaves behind small bits of residue and/or peels small bits of paint (it is worse the fresher the paint is).

For both times of testing it is easier for us if there are few or no other workers present. Our hoses and duct equipment can get in the way if the return we connect to is in a narrow hall or smaller space.

  • Cost: $200.00 for the first system, $150.00 for each additional system.
  • The testing is mandatory. Tested at 25 pascals, total leakage, less than or equal to 4 cubic feet per minute per 100 square foot of conditioned floor area.
  • Exception: when the ducts and air handlers are ENTIRELY within the building thermal envelope.
  • Maximum leakage that is allowed is 4 cubic feet per minuteĀ “per 100 square feet of conditioned space”