PB 3305646SYN Synthetic Washable Panel Air (Hopper) Filter for Minuteman / Power Boss Sweepers and Sweeper/Scrubbers. Our poly spun-bond material stands up to heavy dirt and dust. A popular item, as requested by our customers. A water-washable synthetic version of the PB-3305645. Spun-bond poly media is just as effective at trapping dust particles but has the advantage of being washed out with water or compressed air (make sure to dry completely before re-installing). These synthetic filters hold up to constant washings over it's life. These are much more durable than the standard paper filters which can only be blown out with air. Measures 18 x 20 x 2.75". Sturdy galvanized frame includes black or grey poron gasket. Fits many Minuteman / Power Boss models including FS/7X, SW/88HD, CSS90HD, TSS90HD, ISS90HD, 8290 (90 Series) and 9082 (90 Series). Most units require one or two filters. Some models such as 8290 (90 Series - TSS/90, ISS/90, and CSS/90) Combination Sweeper/Scrubbers and 9090 (90 Series) require two filters. Please check your model before ordering. Priced each. Replaces Minuteman/Powerboss 3305646SYN, 305646SYN, 3334167, 334167