16x21x4 (Actual Size) AccumulairA (R) Diamond 4-Inch Filter (APR 1950)

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AccumulairA (R) Diamond MERV 13 More than 30 times more efficient than ordinary fiberglass filters Highest efficiency AccumulairA (R) filter on the market Meets criteria required for certification in the Leadership in Energy Environmental Design Lasts up to three months

16x21x4 (Actual Size) AccumulairA (R) Diamond 4-Inch Filter (APR 1950) Review

Im very satisfied with 16x21x4 (Actual Size) AccumulairA (R) Diamond 4-Inch Filter (APR 1950) in general, and it works great. This furnace parts & accessories has best relation price-quality.