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Blind-Alley Ducts
Occasionally found in duct systems that use joist
spaces or other parts of the building structure to channel air
flow, blind-alley ducts occur as a result of mistakes made during
installation. A blind-alley duct leads nowhere, except possibly
to the outside, while the register it was supposed to serve has
no source of heat. The room containing this register is therefore
cold. If a room always seems too cold or a register doesn't seem
to have any air flowing out of it, it may be worth investigating.
These blind-alley ducts should be sealed, caulked and insulated, especially when located on an exterior wall.
