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Air leaking from forced-air ductwork is not
as obvious as leaking water pipes or natural gas lines. However,
it can cause serious problems such as back-drafting of combustion
appliances, contamination of indoor air, high energy bills and
uncomfortable homes. Duct leakage must be measured to determine
the impact on a particular HVAC system. If duct leakage is
significant, the ducts should be sealed. Title-24 allows duct
leakage factors to be 15% of fanflow for chage-out's, and 6% of
fanflow for new construction.
A “Duct Blaster” test - can determine the total duct leakage area
(the sum of all leaks in the duct system.) The test is performed
by sealing off all registers temporarily and then pressurizing the
ducts to 25 Pascals. Our computer can measure the amount of air
escaping from the ducts.
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