high speed metal spiral door

The body of sectional door is forming by 40 mm sandwich panels.  Overhead Industrial sectional doors are the most durable and longest lasting doors to ensure circulation at the areas of the factory entrance and exit of goods, loading and unloading areas. These panels provides sound and heat insulation due to the intense doped polyurethane insulation was injected between galvanized steel sheet. (50 kg/m3). Industrial sectional door systems provide space-saving with opening parallel to the ceiling.Any opening can be used clearly . and produces in accordance with the transition range and the height in the factory buildings or warehouses. 2018 Rapid Rolling Door High Speed Roller Shutter Doors Building Material  The spiral door is a burglar-proof and weather-proof, forming a high-speed exterior door to meet today`s demands. When the door laths are rolled up, they do not touch as they are separated by a…