... the air-ports of the AC system is specially designed for the cleaning of returning and circling air in the rooms and other spaces.The air circles in the ... Filter Screens, Cold-Accelerant which is functional for removing the Sulfid, BHC, NH3, HCHO, and bad smell ... screen laminar flowstylelow/mid/high filter screens absorbing the dustbig windage for mid/high filter screenshighregular screens changing, high ...