Pleted Foam Washable air filters: 1. Custom available 2. Fireproofing 3. UL 94 HF-1, UL900 class 2 Pleted Foam Washable air filters:reusable,replaceable,removable SizeCustomizedFrame Stamping aluminum alloy or according to client's requestMedium colorBlack, gray, green, yellowMedium porosity 25-60PPI Certifications UL 94 HF-1, UL900 class 2,ISO 9001:2008,OHSAS 18001:2007 Application Industrial, ...