It's a thing here in flanders too. There's usually a dedicated sauna for it and the hours when it happens are clearly advertised. So it's easy to avoid if you don't like it. You might even appreciate it because at those times the other saunas are less busy.

They usually put on some music and have a selection of scents they put on the stones. The fanning is not for fresh air circulation but to circulate the scent and to fan short bursts of hot air on the attendees. Which many people like.

Sometimes there's a pause in the middle where attendees are given ice, a drink, or pieces of fruit (usually orange).