Harzardous process piping may be installed within the space that functions as a wall in an exit corridor, if a mechanical ventilation exhaust system is provided, the ventilation system shall be capable of ___ complete air ch anges per hour.

Harzardous process piping may be installed within the space that functions as a wall in an exit corridor, if a mechanical ventilation exhaust system is provided, the ventilation system shall be capable of ___ complete air ch anges per hour.