N.Y. Comp. Codes R. & Regs. tit. 12, § 8-2.27 – Counterweights. In factory buildings erected before or after October 1, 1913; in mercantile establishments in buildings erected before of after November 1, 1920.

(a) Counterweights that run in the same hoistway as the car shall be guarded throughout their travel unless there is a car enclosure on counterweight side, in which case a bottom shield not less than five feet high shall be provided.
(b) Counterweights that pass through the floors outside of hoistway shall be guarded on exposed sides to a height of six feet from the floor.