Mich. Admin. Code R. 408.4260 - Furnace access openings

Rule 260. A firedoor or other access opening, not less than 11 x 15 inches or 10 x 16 inches or 15 inches in diameter, shall be provided for the furnace of an internally fired boiler other than cast-iron which the least furnace dimension is 28 inches or over.

Notes

Mich. Admin. Code R. 408.4260
1979 AC

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