... Resistant 1,Material: PVC flam-resistant static-free fabric with steel wire reinforced.2.PVC Thickness:0.3mm-0.45mm.3 ... environment such as tunnel, basement, ship building or welding, laboratory ,air-conditioner,engine room, the municipal conduct engineering,fire-fighting to ventilate ... can conveniently connect to the portable ventilator to use together. air conditioner duct