HVACQuick.com Accumulair 4 Inch Filters - MERV 6 FC21.5X24X4A

21.5x24x4 (Actual Size). Accumulair MERV 6 Filters. Accumulair Emerald Series MERV 6 Filters - 4 inch thickness. Economical, high-capacity media makes this filter an ideal upgrade from standard fiberglass throwaways. Captures a wide variety of airborne allergens including dust, mold, pet dander, and dust mites. Rugged and durable. Will not warp or leak under normal operating conditions. Up to 8-times more effective at capturing micro particles than ordinary fiberglass filters. Excellent for high-velocity systems and maximum air flow. Lasts UP TO 3 months. This product is listed and rated by Underwriters Laboratories as U.L. Class 2.