... filter: 1.Fireproofing 2.RoHS Compliant, 3.UL certified 4.Reusable,Replaceable Flame Retardant air filters are the ideal solution to meet filter ... , gray, green, yellowMedium porosity25-60PPICertificationsUL 94 HF-1, UL900 class 2,ISO 9001:2008,OHSAS 18001:2007FinishingBlack oxide coating or follow ...