Wow, different countries, different rules.
Where I live it would be shut immediately.
I also worked with CO2, and noticed that it got me a bit more tired if I didn't turn it off.
(But I have the same in a house that is not well ventilated.)
My generator ran on natural gas. Really cheap and not all he hassle with bottles etc.
The CO2 was sucked in at the backside of watercooled AC and then pushed out at the front through plastic tubes with holes in it.
The tubes were hanging in between rows of 600 W HPS lamps.
Holes were directed towards the plants.
This serves 2 purposes: It was like ventilation (because wind and cooled air came out), and the CO2 was directly at the plant.
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