New York Codes, Rules and Regulations
Title 12 - DEPARTMENT OF LABOR
Chapter I - Industrial Board Of Appeals
Subchapter A - The Industrial Code
Part 4 - Low Pressure Boilers
Subpart 4-6 - Installations, Repairs And Replacement Of Low Pressure Heating System Boilers
Section 4-6.8 - Requirement for boiler room exits-boilers installed after march 31, 1965

(a) Boilers installed in existing spaces or rooms. If a boiler is installed after March 31, 1965 in a space or room constructed before March 31, 1965, which previously housed a boiler, such space or room shall be provided with at least one exit not less than 30 inches wide. If a door is provided it shall open in the direction of egress.

(b) Boilers installed in new spaces or rooms. If a boiler is installed after March 31, 1965, in a space or room which was not previously used to house a boiler, such space or room which has an area of less than 300 square feet shall be provided with at least one exit not less than 36 inches wide. If a door is provided it shall open in the direction of egress. If such space or room has an area of 300 square feet or more, two remote exits shall be provided. One of these exits shall be at least 36 inches wide and if provided with a door, the door shall open in the direction of egress. The other exit may be a permanent vertical or inclined metal ladder not less than 18 inches wide, affording access to an opening having a least dimension of 36 inches. If such opening is provided with a door, it shall open in the direction of egress.