- Air change rates or cfm/sq ft
- Dead zones within the space
- High and low exhaust locations
- Pressure differentials between rooms of different uses to avoid vapor flow to unclassified areas
Although the Board concluded that CAI was a grandfathered facility and did not need to apply NFPA, a walk-through of the facility by a trained HVAC/Mechanical Engineer would have quickly revealed that simple changes to the ventilation system could have prevented the explosion.