Elevator Hoistway and Machine Room Ventilation

The currently adopted version of 524 CMR, Board of Elevator Regulations, has removed the longstanding requirement for elevator hoistway and machine room ventilation. Since the adoption of the latest version of the code, there has been some confusion as to whether the removal of this requirement was intentional. Based on discussions with the Massachusetts Division of Professional Licensure, Office of Public Safety and Inspections (OPSI), and the Massachusetts Elevator Board, we understand that the removal of this requirement was intentional and that 524 CMR no longer addresses the control of smoke and hot gases within elevator hoistways or machine rooms. Machine rooms/spaces and control rooms/spaces are still required to be provided with natural or mechanical means to maintain air temperature in the range of 50°F-90°F and humidity in the range specified by the elevator equipment manufacturer to ensure sage and normal operation of the elevator (542 CMR 2.7.9.2). Similarly, the Massachusetts State Building Code (780 CMR) requires that machine rooms/spaces and control rooms/spaces to be provided with an independent air-conditioning system or ventilation to protected against the overheating of the electrical equipment, and that the system be capable or maintaining temperature within the range established for the elevator equipment (780 CMR 3005.2).