52 Pa. Stat. § 70-512
Current through P.A. Acts 2024-18
All crosscuts connecting the main inlet and return air passages of every district, when it becomes necessary to close them permanently, shall be substantially closed with brick or other suitable building material, laid in mortar or cement: Provided, however, That where physical conditions prohibit the use of such materials, timbers laid longitudinally "skin to skin" may be used. All stoppings shall be reasonably air tight.
52 P.S. § 70-512