Expanded Aluminum Panel Air Filter: 1.High mechanical strength 2.ROHS compliance 3 ... .Excellent flexibility 4.UL certified Expanded Aluminum Panel Air Filter: ideal for use in equipment where permanent, cleanable ... gray, green, yellowMedium porosity 25-60PPI Certifications UL 94 HF-1, UL900 class 2,ISO 9001:2008,OHSAS 18001: ... electronics,networking,communications,HAVC,broadband/CATV.,etc Air Filter