... filters: 1. RoHS compliant 2. UL 94 HF-1, UL900 class 2 Customized Network Cabinet air filters manufacture: Products featuresHigh dust holding,low ... , gray, green, yellowMedium porosity25-60PPICertificationsUL 94 HF-1, UL900 class 2,ISO 9001:2008,OHSAS 18001:2007FinishingBlack oxide coating or follow ...