Plastic Surface Smokeproof Door Stopper YD-607 1)Dimensions: 75Lx90Wx35H(mm) 2)Holding Force: 70kg(150Lbs) 3)Voltage: 12/24VDC+10% 4)Current Draw: 12V/100mA 24V/50mA 5)Suitable for: All Kind of the Single & Double Smokeproof Door 6)Surface Temp: ≤+20°C 7)Operating Temp: -10 +55°C(14-131F) 8)Suitable Humidity:0 90%(non-comdensing) 9)Finishes for Shell: High Temperature Paint and Environmental Protection Zinc 10)Finishes for Armature: Zinc 11)Weight: 0.82kg Standard Packing: 20pcs.