... color, drive mode is optional. steel fire resistance roller shutter Fire resistance period: 1- 5 hoursIntroductionTOMA Fire Resistant Shutter is constructed, tested, ... still functional after 310 minutes fire.Materials and Finish:Zincalume Steel, Galvanised Steel, Electro Galvanised Steel, Prepainted (Colourbond) Finished or ... then trigger the door to close down. steel fire resistance roller shutter