... : 305 * 110 * 50 mm9, Side: left / right10, Door size: 1250 * 2300 mm11, Door thickness: 8 – 12 mm glass12, Door bearing weight ... on outside door, taking wind power into consideration, twin-cylinder floor spring should be chosen regardless of door size. This is because ... twin-cylinder floor spring is better than single-cylinder floor spring for the 0°Orem position and 90°Orem ...