Section R. 408.10926 - SuppliesRule 926.
(1) A stock of extra sprinklers shall be maintained or readily available for each temperature rating and type so that the system can be returned to readiness as soon as possible.(2) An automatic sprinkler system of more than 20 sprinklers shall have at least 1 automatic water supply capable of providing design water flow for not less than 30 minutes.Mich. Admin. Code R. 408.10926