Section R. 400.10549 - Air-handling equipmentRule 549.
(1) In newly constructed or converted large or secure facilities, air conditioning, warm-air heating, air cooling, and ventilating systems shall comply with the provisions of the national fire protection association pamphlet no. 90A, entitled "Air Conditioning and Ventilating Systems," 1978.(2) In newly constructed or converted large or secure facilities, fans and air-handling equipment used for recirculating air in more than 1 room or single area shall have a thermostatic device with a setting of not more than 125 degrees Fahrenheit or an approved automatic smoke detector located in the system at a suitable point in the return air duct ahead of the fresh air intake, the actuating of which shall open the electrical circuit that supplies the fan motor. Fan rooms shall be designed and used only to house other mechanical equipment.(3) In existing facilities, fans and air-handling equipment and systems that are approved pursuant to R 400.71 et seq. shall continue to be approved until the facility is converted. This subrule does not abrogate requirements relative to maintaining the equipment and systems in proper and safe working order.Mich. Admin. Code R. 400.10549