Mont. Code Ann. § 50-61-106
Unlawful to obstruct fire exit -- exception
50-61-106 . Unlawful to obstruct fire exit -- exception. Except as provided in 50-61-122 , it is unlawful to obstruct in any manner any fire exit, or any hallway, corridor, or entranceway leading to a fire exit, required by rules adopted by the department of justice.