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furnace filters

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    How do I find my furnace filter dimensions?

    Most furnace filters have two sets of dimensions: Nominal and Actual. If your furnace filter has actual measured dimensions of 15½" x 24¾" x ¾", you would search based on the nominal dimensions of 16" x 25" x 1". When determining the size of furnace filter you need, it is best to measure each...
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