Blower Door Tests
The most rigorous way to locate duct leaks is with a blower door or similar
analysis performed by a professional. This analysis measures the magnitude of
your duct leakage and identifies its location.
Some companies offer ductwork sealing services with a follow-up blower door
check to ensure duct leakage has been reduced to acceptable levels.
A blower door is a special instrument used to measure air leakage in a
building shell and its ductwork. The equipment consists of a temporary door covering
which is installed in an outside doorway and a blower which forces air into or
out of the building. The blower door measures how leaky the building and
ductwork are, and can be used to find the location of the major leaks. Without a
blower door, finding the leaks in the ductwork can be difficult since the ducts
are often in hard to reach areas such as the attic or crawl space and the leaks
are usually hidden from view by duct insulation.
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