Roller shutter doors opening and closing time see clearly whether there is a lot of up and down, especially the fire shutter doors and fire-fighting system, often because of improper operation fire shutter doors damaged, or italic. General Electric roller shutter doors should also pay special attention to, curtains opening and closing at the same time should be at the scene, in case the curtain tilt or orbit should stop opening and closing the curtain, curtain so as not to give machine and caused more damage