Section R. 408.30545a - Masonry heater clearanceRule 545a.
Section R1002.5 of the code is amended to read as follows:
R1002.5. Masonry heater clearance. Combustible materials shall not be placed within 36 inches (914 mm) of the outside surface of a masonry heater unless installed in accordance with NFPA 211, and the required space between the heater and combustible material shall be fully vented to permit the free flow of air around all heater surfaces. Exceptions:
1. When the masonry heater wall is at least 8 inches (203 mm) thick of solid masonry and the wall of the heat exchange channels is at least 5 inches (127 mm) thick of solid masonry, combustible materials shall not be placed within 4 inches (102 mm) of the outside surface of a masonry heater. A clearance of at least 8 inches (203 mm) shall be provided between the gas-tight capping slab of the heater and a combustible ceiling.2. Masonry heaters listed and labeled in accordance with UL 1482 may be installed in accordance with the listing specifications and the manufacturers written instructions.Mich. Admin. Code R. 408.30545a