We have 6 Floors of Underground Parking on a high Multi-Use Tower. Total Project size is over 1,000,000 sqft and the parking areas are approximately 25,000 sqft to 30,000 sqft per floor.

With regards to the hazardous gas and chemical use areas, would we have to comply fully with maintaining negative pressure and self closing doors for the entire parking area at each floor? Or can we show compliance through sufficient exhaust and ventilation?

Any input would be much appreciated.