Composite fore rolling shutter with special exit door offers if power fails during fire rising. Tecjmoqie property Fire--resistance time:4 hours Heat radiancy:O.4W/cm3 Smoke proof:When pressure dispersion is 20Pa, curtain srooke Hakage Iess than O.2M3/m2.min Anti--pressure:80Kg/m2 Open and close speed:2—9m/min Technique Parament Genaral size:the exit door size not less than 1.7m(height)一0.7m(width) The exit door open angle not less than 90 degrees