Wind-resistant grade of wind-resistant rolling shutter door Chinese brand (Shandong Zhixin Doors and Windows Technology Co., Ltd.) Before understanding the wind-resistant grade of wind-resistant rolling shutter door, we should first understand the wind-resistant principle of wind-resistant rolling shutter door: first, when the rolling shutter door is open, the wind-resistant steel hook will be retracted. How does the wind-resistant hook of wind-resistant rolling shutter door resist wind? When the wind-resistant rolling shutter door is closed, the spring of the wind-resistant hook starts to open the steel hook, and if the door curtain is curled by large wind force or external force outside the door, the wind-resistant steel hook can hook the groove, so that the groove can be effectively prevented from being separated from the groove due to large stress. The wind resistance grade of the wind-resistant rolling shutter door varies greatly according to the manufacturing materials and structures. However, at present, some manufacturers can make the wind resistance grade of the wind-resistant rolling shutter door 784.5 Pa. If the wind resistance grade is only 50, it is an ordinary rolling shutter door.
