2.1.6 Projections, Recesses, and Setbacks in Hoistway Enclosures
(a) beams, floor slabs, or other building construction making an angle less than 75 deg with the horizontal shall not project more than 100 mm (4 in.) inside the hoistway enclosure unless the top surface of the projection is beveled at an angle not less than 75 deg with the horizontal
(b) separator beams between adjacent elevators are not required to have bevels
(c) where recesses or setbacks exceeding 100 mm (4 in.) occur in the enclosure wall, the top of the recess or setback shall be beveled at an angle not less than 75 deg with the horizontal
(d) bevels are not required if the projections, recesses, and setbacks are covered with material conforming to the following:
(1) It shall be equal to or stronger than 1.110 mm (0.0437 in.) wire.
(2) It shall have openings not exceeding 25 mm (1 in.).
(3) It shall be supported and braced such that it will not deflect more than 25 mm (1 in.) when subjected to a force of 4.79 kPa (100 lbf/ft2) applied horizontally at any point.