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
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No doubts, that is one of best producer of this furnace parts & accessories. All of my mates tell me, that I must buy 21.5x23.25x4 (Actual Size) AccumulairA (R) Diamond 4-Inch Filter (APR 1950). The earlier I buy it, the better it is.