Exhausted enclosures containing highly toxic or toxic compressed gases in any quantity shall comply with Section 18-28-502.7.2 and the following requirements:
1. The average ventilation velocity at the face of the enclosure shall be not less than 200 feet per minute (1.02 m/s) with a minimum velocity of 150 feet per minute (0.76 m/s).
2. Exhausted enclosures shall be connected to an exhaust system.
3. Exhausted enclosures shall not be used as the sole means of exhaust for any room or area.