how do you address stale air in a crowded room, air conditioned by split airconditioners?
Answers:
The only way to address stale air in a building is an air change. You need a filtered supply of outside air. You'll be surprised how well a 12 inch filtered air duct from the outside will help. We have a 16 inch setup where I work. We have it tied into a 10 ton unit with a timer on the intake side of the a/c unit. The vent to the outside opens every 30 minutes for a 10 minute cycle. So for every hour the unit runs we bring in 20 minutes of fresh outside air. Contact an a/c professional in your area since you sound like a business and you'll want to stay up to code for insurance reasons.
mike
Other answers:
Fans will help.
Fans will help.
Chop onions in half & put in corners of reception replace has often as you need to,smell will soon vanish