1, the effective width of the double-layer aluminum curtain DAK77 piece of 77mm, between screens films thong unique muffler design, so that when the door rotates truly silent; thickened, widened aluminum guide worse unique institution, from the door to the large span wind effect, the products are widely used in villa garage, shops and large factories, warehouses, the maximum span of up to 8.5 meters wide. Shutter doors industry's first production in Nanjing, mainly engaged in the production, wholesale, production, installation and maintenance of train services. Mainly for electric roller doors, garage doors, aluminum profiles doors, wind shutter doors, http: //w136115.jdol.com.cn/gongying/8074222.html