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Duct Air Leakage Testing (DALT)

Duct leakage can significantly increase air conditioning and heating bills, dramatically reduce equipment capacity and performance.
Leaks in forced air duct systems are now recognized as a major source of energy waste in both new and existing buildings. Studies indicate that duct leakage can account for as much as 20% of total energy loss, and in many cases has a greater impact on energy use than air infiltration through the building shell. Just as important, duct leakage can prevent heating and cooling systems from doing their job properly, resulting in hot or cold rooms, and humidity problems. 

Leaks in the supply ductwork cause expensive conditioned air to be dumped into the attic, crawlspace or mechanical room instead of its designed location.
Return leaks pull outside air (hot in summer, cold in winter) into the duct system reducing both efficiency and capacity. In humid conditions, moist air being drawn into return leaks can overwhelm the dehumidification capacity of air conditioning systems causing rooms to feel clammy even when the air conditioner is running.

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NEBB - DALT