... ,Material: PVC flam-resistant static-free fabric with steel wire reinforced.2.PVC Thickness:0.3mm-0.45mm.3,Diameter ... such as tunnel, basement, ship building or welding, laboratory ,air-conditioner,engine room, the municipal conduct engineering,fire-fighting to ventilate ... or exhaust waste air,dust to supply fresh air.keep more savely and effectively during working. ...