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1 of the most important things with explosion proof is that the power source be outside of the contaminated air flow. The venturie set up must have the air flow away from the power set up. If the air is all coming from the same enviornment the more powerful suction will also draw contaminated fumes into the air being used to pull from the spraybooth as the secondary draw will be under less pressure. one of the best set ups I;ve seen was a body shop had the primary airflow pumped from outside with the pick up pulling from the spraybooth on the way by. No cross contamination. Just remember that static electricity is a huge problem with any air movement so you need to ground the system very well. Static is a problem with dust collection.
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