23.5x30.75x4 (Actual Size) Accumulair Diamond Filter MERV 13

$32.54

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From AirFilters.com

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