Section R. 400.18624 - Cooking appliancesRule 624.
(1) A cooking appliance shall be suitably installed in accordance with approved safety practices.(2) Where a metal hood or canopy is provided over a main kitchen cooking appliance, the hood or canopy shall be equipped and designed in compliance with the provisions of the national fire protection association's pamphlet no. 96, 1971 edition, entitled standard for the installation of equipment for the removal of smoke and grease-laden vapors from commercial cooking equipment, which is adopted by reference in R 400.18659.(3) A filter shall be maintained in an efficient condition and kept clean at all times.(4) Only vaporproof-type electrical wiring and equipment shall be permitted in a hood or canopy.(5) An exhaust duct from a hood shall be run to the outside by the shortest possible route and when run through an open space between a ceiling and a floor or roof or through a floor above, shall be enclosed in a horizontal or vertical shaft that is protected from the remainder of the building by construction which will afford a 2-hour-fire resistance rating.Mich. Admin. Code R. 400.18624