Replacement Self Cleaning Filter, Filter Type Reusable Filter, Filter MERV Rating 15, Compatible Extractor Series Filtair MWX-S, Filtair SWX-S, Compatible Extractor Manufacturer Part Number 300600, 951510, 951511, 951512, 951516, 951517, 951518, 951620, 951760, 951761, Features Designed Specifically for Weld Fume, Surface Loading Design, Ultra Efficient, Filter Efficiency 95 Percent, Filter Media Cellulose, Process Welding Fume Filtration