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Emerson Filter - Emerson Air Filters - Emerson Furnace Filter For FR1000 - F811-0398 Nominal size 16x21x5 Actual size 16 1/4" x 21" x 5"
White Rodgers filters - Air Filter For Models: :ACB1000, ACM1000, FR1000-100 Nominal size 16x21x5 Actual size 16 1/4" x 21" x 5"