Performance Descriptions Wide pleat spacing, easy-cleaning design Top open,bottom open/bottom close with deflating bolt hole Unique plastic rotation, effectively separate the pleats, protect the filter media from abrasion by inner mesh Special flame retardant property Galvanized anti-rust caps and metal frame Rubber seal Applications: Widely used in the plasma laser cutting of large-scale steel, shipbuilding, automotive, metal processing industy, welding fume,thermal spray industry and other special conditions. Selection of Materials: Anti-static coating polyester PTFE membrane polyester PTFE membrane & Frame retardant HV cellulose paper Donaldson PTFE membrane polyester