... ) Safety: non-toxic, harmless, no sensitive reaction Hepa air filters are the most efficient type of air filter available. ... 0.3 microns. The materials we use to produce HEPA Could be classified five types: PP filter paper, ... not released into the air again.Hepa air filter Application:1)Hepa Vacuum Cleaner, Hepa air purifier, etc.2)FFU, ... , good quality and prompt delivery. Mini-pleat hepa air filters