Specifications: 
100% Insulation/sealing: Dual insulation curtain with air layer;
100% auto recovery rate : Zipper type of cloth that slips at both ends has been put in high density side guide to have minimum friction, so 100% self-recovery is possible.
100% safety : Sand filled guide ropes are used instead of iron-made core (2.5 kg/m);
Collision prevention system: Auto sensing when the door is closed.