aFe MagnumFLOW Air Filters IAF PDS A F PDS (3x4 3 4)F (4x5 3 4)B (2 1 aFe 21 91076 for MagnumFLOW Air Filters PDS A F CCV PDS 3F X 6B X4 1 2T aFe MagnumFLOW Air Filter UCO PDS A F PDS 4F x 8 1 2B x 8 1 2T x 11H eBay aFe MagnumFLOW Air Filters UCO PDS A F PDS 3F x 6B x 4 3 4T x 9H eBay. With three layers of progressively finer mesh synthetic media between 100% polyurethane top and base, this high flow, "oil free" conical performance filter provides maximum convenience and easy maintenance with excellent airflow. Washable and reusable for multiple cleanings, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Pliable polyurethane flange with integrated bumps insures tight, no leak seal over the life of the filter. This filter has a 99. 2% filter efficiency.