Depending on where your filter is, whether in a filter grill or in the furnace itself, take a tape measure to said cavity. if you have one of the previous filters you can do as mc1bean said and take the filter to home depot or another hardware store. or if you look very closely at the filter's edge you'll find the dimensions in three parts. 20x24x1 or something of that sort. the washable filter mc1bean was talking about is called hogs-hair, you should be able to find that as well and experiment with it.
Good luck.
Hello, what i do and have done with mine, is I have taken it down to Home Depot and they match it up. However another thing I have done, is they make filter that you just cut to size. They are cheaper than actually buying the one that fits it by manufacturer. It comes in a section, and you just get out some snips and cut it to size and save yourself lots of money, and they work just as good. Mike
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What is the make and model # of your Furnace?
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