A. Overhead clearance measured from sitting surface, minimum 1010 mm (39.8 in.)
B. Forward horizontal clearance (as measured from any obstruction, or front [user] side of backrest, if present) #1
B1. Clearance for operation tasks (relaxed posture), minimum 1034 mm (40.7 in.)
B2. Clearance for maintenance tasks (upright posture), minimum 867 mm (34.1 in.)