N.Y. Multiple Residence Law § 139

§ 139. Boiler rooms. In every dwelling the boiler or furnace of a\ncentral heating plant shall be enclosed in a fireproof room or space and\nall openings therefrom to other portions of the dwelling shall be\nequipped with fireproof doors and assemblies with the doors\nself-closing, except that in any dwelling three stories or less in\nheight, such room or space may in the alternative be enclosed with walls\nor partitions constructed of fire-resistive materials and the ceiling\nfire retarded.\n