Mich. Admin. Code R. 408.30541a - Duct Installation
Rule 541a. Section M1502.4.2 of the
M1502.4.2. Duct
Installation . Dryer exhaust ducts shall be supported at 4 foot (1 219 mm)
intervals and secured in place. The insert end of the duct shall extend into
the adjoining duct or fitting in the direction of airflow. Ducts shall not be
joined with screws or similar fasteners that protrude into the inside of the
duct.
Notes
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