and their guides, guide shoes, tracks, and hangers shall be designed, constructed, and installed so that when the fully closed door
is subjected to a force of 335 N (75 lbf), applied on an area 300 mm (12 in.) square at right angles to and approximately at the center of the door
, it will not deflect more than 13 mm (0.5 in.) toward the hoistway door
Where a swing-type hoistway door and car gate or folding door are used, the gate or folding door shall not deflect more than 13 mm (0.5 in.) when subjected to a force of 335 N (75 lbf) when applied to the hoistway side of the car gate or folding door at the following locations:
(a) an area 100 mm (4 in.) square at right angles at the approximate center of the gate or folding door opening
(b) an area 100 mm (4 in.) square at right angles at 25% and 75% of the door width at a height of 450 mm (18 in.) from the floor level
For individual panels of folding doors of a width less than 100 mm (4 in.), the specified forces in (a) and (b) shall be applied over an area 100 mm (4 in.) tall by the width of the individual panel.
When subjected to a force of 1100 N (250 lbf) similarly applied, doors and vertically sliding gates shall not break or be permanently deformed and shall not be displaced from their guides or tracks.
Where multisection doors, gates, or folding doors are used, each panel shall withstand the forces specified.