... ,flex duct1,Material: PVC flam-resistant static-free fabric with steel wire reinforced.2.PVC Thickness:0.3mm-0.45mm ... working environment such as tunnel, basement, ship building or welding, laboratory ,air-conditioner,engine room, the municipal conduct engineering,fire-fighting ... supply fresh air.keep more savely and effectively during working.with the strap or pp rope can conveniently connect to the ...