Regular Biparting doors are used in hoistways that have ample floor to floor height.

Each floor to floor height must be equal to or exceed 1.5 times the landing door height, plus 150mm (6 in.). Overhead height at the top landing must equal or exceed 1.5 times the landing door height, plus 100mm (4 in.). Pit depth must equal or exceed 0.5 times the landing door height, plus 150mm (6 in.), measured from the lowest landing sill.

Required car clearance between the elevator platform and building sill is 125mm (5 in.).
Where any single floor to floor height is insufficient, use a Pass-Type Biparting hoistway door.