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    FlavioCarlos's Avatar
    FlavioCarlos Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Feb 22, 2008, 09:37 PM
    Thumping sound from VENT
    I have a 4 year old attic furnace which recently started making a thumping noise soon after the blower shuts off. The thumping noise is coming out of the Master BDRM Filter Vent. I checked the filters and they are good. The filter vent is also well secured. Any idea what it could be??
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 23, 2008, 12:40 AM
    Could be a

    Broken motor mount
    Loose blower wheel.
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