Fire Door, High Speed Door, Rapid Door manufacturer / supplier in China, offering 6000-15000kg Truck Dock Ramp for Loading Bay, Motorized Single Leaf Sliding Gate, Vinyl Roll up Doors for Pharmaceutical Industries 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.