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TO DETERMINE THE SIZE FILTER TO ORDER:

Method 1:  If you are currently using a throw-away fiberglass filter, take the

size written on your existing filter and deduct 1/4 inch from both sides. For

example, if your throw away filter is:   20 X 20, then you would order

19 3/4 X 19 3/4 actual dimension.

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Method 2:  Actually measure your existing filter, but be sure that your existing

filter fits well.

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Method 3:  Measure the opening provided for the filter in your furnace, ceiling

filter grill, or wall filter grill and deduct 1/4 inch from both sides.  For example, if

the opening provided for the filter in your furnace measures 18 X 20, then you

would order 17 3/4 X 19 3/4

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