Description Chamberlain LiftMaster Belt Rails Pre-assembled and part tensioned Options: One piece belt rail 2.5m, Chamberlain part number 8025CR5. • Door opening: 2.5 m • Length of travel: 2687 mm • Total length: 3187 mm Two piece belt rail 3.2m, Chamberlain part number 8232CR5. • Door opening: 3.3 m • Length of travel: 3500 mm • Total length: 3980 mm Two piece belt rail 4.0m, Chamberlain part number 8240CR5. • Door opening: 3.9 m • Length of travel: 4145 mm • Total length: 4680 mm
