Mich. Admin. Code R. 408.30754a
Current through Vol. 24-19, November 1, 2024
Rule 754a. Section 903.2 of the code is amended to read as follows:
Section 903.2. Frost Closure. To prevent frost closure, every vent extension through a roof shall be a minimum of 3 inches (76 mm) in diameter. Any increase in the size of the vent shall be made inside the building a minimum of 1 foot (305 mm) below the roof or inside the wall.
Mich. Admin. Code R. 408.30754a