18-28-502.7.2 Gas rooms, exhausted enclosures and gas cabinets.
   The ventilation system for gas rooms, exhausted enclosures and gas cabinets for any quantity of hazardous material shall be designed to operate at a negative pressure in relation to the surrounding area. Highly toxic and toxic gases shall also comply with Sections 18-28-502.8.7.1, 18-28-502.8.7.2 and 18-28-502.8.8.4.