Section R. 325.2437 - Local exhaust ventilationRule 37.
(1) Local exhaust ventilation shall be provided at all stationary sources. The director may allow a variance from this requirement if control is accomplished with general ventilation.(2) If a local exhaust system is used, then the exhaust air volume shall create an indraft air volume at an enclosure, hood, duct, or fan sufficient to control the contaminant.(3) A local exhaust system shall be designed to capture and control the contaminant. Distribution of exhaust air between various exhaust points may be accomplished by balanced duct design. If balancing gates are used, then they shall be locked permanently in place after final adjustment.(4) The design and construction of a local exhaust ventilation system shall be adequate for the contaminant and conditions of service. A listing of practical ventilation texts and references shall be available from the director upon request. Technical information and experience regarding specific contaminants and control measures may be obtained from the director.Mich. Admin. Code R. 325.2437