Referring to this discussion:
I am asking whether MDF is formed with wich glue.
It could be the “bad type” (dark, water resistant) or close to that which causes a lot of smoke although MDF is not water proof at all, but as it’s the cheapest material they might use any kind of cheap smoking glue.
So if there’s a lot of smoke it makes sense that this is blown away/through the gap with a lot of air. Which would be a general aspect. (which confirms my idea of the on-top-smoke extraction that I have built but not used yet due to other problems).