... efficiency filtrate net which is made of fiberglass, can filtrate small particle with the size less than 0. 0001mm, such as dust ... machine. Micro computer control, four-lay filter and over oxygen device, with high level, mid-level and low level wind, timing can ... be set 1hour, 2hour, 4hour and 8hour, Four-lay filter with triple purify effect, remote control.The surface color can be ...