Fire Door, High Speed Door, Rapid Door manufacturer / supplier in China, offering PVC Fabric Rapid Roller Shutter for Cargo Handling, Retractable Dock Seal for Loading Zone, Vinyl Roll up Doors for Warehouses and so on.
Two high speed doors can be interlocked. When one door is open, another door will keep close. They can not open at the same time. In this way, there will be always a partition between inside and outside room, to protect inside air or hygiene.