The industry sectional door is also named electric sliding up door. It is suitable for every building’s outside and inside installation. It is beautiful, high-intensity, reliable, stable, low noise, airtight, and constant temperature, it also takes low construction rate in workshops’ space and improves the production efficiency. So it is widely used in medical, food industry, electronic, machinery, supermarket and other workshops which need high cleanliness because of its low installation conditions and high practicability. There is a manual-electric exchange device on the door opener, when the electricity is cut off, the manual device will be turned on. The airbag in the bottom will be bounced off when it hit a barrier. It is insurance. Light window, door in door, controller are all can be added is the industry sectional door. There is an interlock between the two doors (door in door), when the small door open, the switch will be cut off and the control power will also be cut off. And the big door can’t move any more to ensure the security.