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Furnace Filter, Pre-Pleat 40, 20 x 20 x 4-In.

Flanders

20" x 20" x 4", pre-pleat 40 air filter, 100% synthetic, high dust holding capacity & low pressure drop, 2 piece heavy duty die cut frame, expanded metal backing & diagonal grid supports for maximum strength, merv rating 8, 90 day filter, effective against pollen, dust/lint, dust mites, pet dander, mold, bacteria, virus carriers.