Mich. Comp. Laws § 400.721

Sec. 21. (1) Except as provided in subsection (2), an adult foster care facility licensed on March 27, 1980 shall be considered to be in compliance with the fire safety standards prescribed in rules promulgated under this act if the facility meets the fire safety standards prescribed in rules promulgated under former Act No. 287 of the Public Acts of 1972 which were in effect on March 27, 1980. (2) This section does not apply to the installation of smoke and heat detection equipment as required by rules promulgated pursuant to this act.