| http://www.w3.org/ns/prov#value | - RETURN DUCT AIR LEAKS. Hisses and whistles in supply air ducts and registers might be present too - see SUPPLY DUCT AIR LEAKS. Also buzzing, rattling, clanking or other noises originating at the air handler/blower unit may be transmitted into the physical ductwork and thus the building, if the system lacks an adequate vibration dampener VIBRATION DAMPENERS.
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