Valid concern...hadn't considered until now.Somehow missed this thread….
Just saw an ad for this pop up on a feed I have. Went through this thread and didn’t see anything about the thing that immediately caused me concern.
How long before the Fan gets completely gummed up with smoke/grease?
Seems like an interesting concept, but would be concerned about the life expectancy.
Just looked at the fan. A bit dirty but not close to being gummed up. Four screws to take it apart to clean if it eventually gets nasty.