If I fitted a pair of those I think I would have to then get an...

If I fitted a pair of those I think I would have to then get an external dedicated air supply for the wood heater. It is designed to accept that.

It's not an option since I had these fitted and blocked off where the old extractors were in the ceiling.
If anyone else has these, I replaced the crappy light bulbs supplied with LED's which look better are brighter, instant and use less power.

https://www.bunnings.com.au/ixl-3-in-1-mirage-bathroom-heater_p4440339