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| Tools & Home Improvement > Building Supplies > Heating & Cooling > Furnace Parts & Accessories > Furnace Filters |
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| Product Description Depending on the manufacturer, the size on your filter frame could be "Nominal" (by name only) or "Actual" (true size). For example, a 20x24 "Nominal" filter will measure 19 1/2 x 23 1/2.21x23x1 (Actual Size) Air Filter - Furnace Filter- MERV 11 (4 Filters) - CAUTION: Measure your existing filter because the size written on the frame may, or may not be the true size. 21x23x1 (See Caution Note Below) Air Filter - Furnace Filter- MERV 11 (4 Filters) Shipping Weight: | ||||||||
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