Section R. 400.18637 - Heating plantsRule 637.
(1) Heating shall be only from an approved central heating plant or an approved permanently installed electrical heating system.(2) A heating plant shall be enclosed by walls, a floor, and a ceiling that have not less than a 1-hour resistance to fire and at least 1 wall shall be an outside wall that does not expose a closed court. A doorway or other opening through a required heating plant enclosure shall be protected by a B-labeled fire door in a labeled fire door frame, be installed so as to be reasonably smoketight, and be equipped with a self-closing device.(3) A heating plant room shall not be located beneath any portion of a building. This rule does not require the removal of an existing heating plant from beneath an existing congregate facility unless it is required in the interest of public safety. If it becomes necessary to expand the capacity of a heating plant to heat a congregate facility, the expansion shall not be permitted under any portion of the existing building.(4) A furnace room or heating plant enclosure shall be provided with approved air vents which are connected directly to the outside and which are sufficient in size to supply the required volume of air to support proper combustion. Adequate ventilation shall be provided directly to the outside from the ceiling of the heating plant enclosure to eliminate excessive temperature at all times.(5) A portable heating unit is not permitted.(6) A gas meter shall be located outside or in a room that is separated from other occupancies and exposures by not less than a 1-hour-rated enclosure that is vented to the outside. A gas meter may be in the heating plant room if it is located 5 or more feet from the heating unit.(7) A heating plant room shall not be utilized for the storage of combustibles or for a maintenance shop unless the room is protected with automatic sprinklers.Mich. Admin. Code R. 400.18637