Burning ANY chemical is generally bad, as combustion (in general) turns chemicals into "worse" than whatever they are.
I used to work on HVAC, and places like laundries, print shops, body shops, beauty parlors, and even indeed restaurants have materials that cause damage to AC evaporators, furnace heat exhangers, and so on. I worked on appliances "towards the end" of the era of ambient combustion air--most combustion burning stuff nowadays takes in combustion air from out doors---but this still does not help evaporators.
Even uncovered foods in refer units will eat evaporators after awhile. I'm speaking here of commercial restaurants, which might have large amounts of salad type materials---fruits, tomatoes, lemons, etc.
A great example is freon based refrigerants leaking, which is the "same" as some chemicals that are or used to be in brake clean, electromotive and other cleaning chemicals--and running these through combustion results in deadly poisonous phosgene gas---the stuff that Hitler used.
There have been threads about people using some of these chemicals around cutting torches, etc.
No kind of treated woods, painted, stained, or plywood or pressure treated, should be burned.