I HAVE A 16 X 25 X 4.5 FILTER IN MY SYSTEM. MY SYSTEM IS 125000 BTU WITH A 16 SEER YORK STEALTH CENTRAL AIR CONDITION UNIT.MY FILTER LOCATION IS IN MY BASEMENT IS IN AN ENCLOSED ROOM WITH PAINTED FLOOR.VERY LITTLE DUST. I HAVE TWO SIX INCH OUTSIDE AIR DUCTS TO FURNISH FRESH AIR.THE FILTER IS CLOGGED AFTER SIXTY DAYS OF USE. I HAVE A HARD TIME FINDING THESE LARGE FILTERS.IS MY FURNANCE MORE EFFECIANT WITH THIS TYPE OF FILTER VERSES ONE OR TWO INCH FILTERS? CAN I DOUBLE TWO TWO INCH FILTERS AND NOT LOOSE AIR FLOW?
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