Section R. 400.18306 - Interior finishes and materialsRule 306.
(1) The alphabetical classification of finish materials is for flame spread, fuel contribution, and smoke development as determined by the tunnel test in accordance with the provisions of NFPA-255-1972, ASTM-E-84-1968, or UL-723-1971 and grouped as follows: Flame Fuel Smoke
Class Spread Contributed Developed
A 0-25 0-35 0-50
B 26-75 36-75 51-125
C 76-200 76-200 126-200
(2) The same alphabetical classification is used for combustibility of prefabricated acoustical tile units only, pursuant to the provisions of federal specifications SS-A-118B-1958.(3) The documents referred to in subrules (1) and (2) of this rule may be purchased as follows: (a) NFPA-255-1972, from the National Fire Protection Association, Batterymarch Park, Quincy, Massachusetts 02269, at the cost of 50 cents per page.(b) UL-723-1960, from Underwriters Laboratories, Incorporated, 333 Pfingsten Road, Northbrook, Illinois 60662, at a cost of 20 cents per page.(c) SS-A-118B-1958, from the State Fire Safety Board, 7150 Harris Drive, Lansing, Michigan 48913.(4) Paper, cardboard, asphalt paper, or other highly flammable material shall not be used for the interior finish of a group home.(5) Group homes accommodating 13 or more residents shall have a complete, 100% coverage, underwriters laboratories-approved automatic fire detection system, including at least 1 manual pull station per floor level and basement, except in group homes protected completely with an approved automatic sprinkler system. A fire alarm detection system shall be a closed circuit, self-supervised, continuous-ringing system.Mich. Admin. Code R. 400.18306