R 408.14434 Aisles.

Rule 4434. (1) An aisle shall be not less than 24 inches wide where molten metal is poured from hand or bull ladles or crucibles carried by 1 or 2 employees. However, if a mold is 20 inches oR more in height, an aisle shall be not less than 36 inches wide. (2) An aisle shall be not less than 36 inches wide where molten metal is poured by more than 2 employees.