GCC overhead door closer odc 830 ce marking surface mounted ideally suited for most common doors for architectural and commercial applications. Closing force en 2-6. Door width 850 to 1400 mm. Door weight 40 to 120 kgs. Left and right-hand applications. Back check from 52 to 180 degrees. Delay action from 70 degrees. Tested for 500,000 cycles as per ce. Body of precision die-casting aluminum alloy. Extra tensile strength steel alloy springs. High-quality steel components. Heat-treated steel rack and pinion. Thermo constant valve for safety. Stable hydraulic fluid with low sensitivity to temperature changes. Complete with standard arm fittings.