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

    Feb 5, 2009, 05:14 PM
    Lennox furnace
    Hi I need to know the furnce filtre size for a lennox pulse 21 furnace .ty
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 5, 2009, 05:38 PM
    No set size it depends upon the size of the furnace air filter area. Measure it with a tape measure.
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