... HF-1, UL900 class 2 4. Custom manufacture Our telecom air filters offer high dust arrestance and low resistance when ... installed in electronics, computer, telecom, datacom, broadband/CATV, medical, and general purpose equipment where ... 9001:2008,OHSAS 18001:2007 Application Industrial,medical,telecom,electronics,networking,communications,HAVC,broadband/CATV.,etc