... ,blue)+galvanized steel;5.Function:It is heat resistance,acid -base resistance,fire resistance,abration resistance,tearing resistance and flexible DiameterthicknessDistanceDetailsinchinnerPvc coatedwirewirespeedlength2510.40.645cm45m/s10m3760 ... /s10m41020.40.945cm45m/s10m51270.40.945cm45m/s10m61530.4145cm45m/s Fire resistance canvas air duct blue color