is it dangerous to breathe exaust from refridgeration appliances in close quarters ie restraunt/deli?
Breathing exhaust fumes from any machinery or appliance is not good for your health. Exhaust fumes are always composed of the worst chemicals and dirty materials of any machine process.
If you're getting swamped by fumes from three different units then I think you need some definite ventilation in your area. Many delis or restaurants have huge fans to eliminate fumes or heavy cooking smells. I think ventilation in your area will take care of your nausea.
