Recognise this extractor fan?

[Adam2]

The fan has stopped - about 12 years' old so time to go to fan  recycling heaven/wherever. Only issue is that there is no obvious way to remove the outer cover! No screws, no obvious leverage points, even tried a very hard pull with a pipe wrench and not coming off. Before I start battering it and messing up the WC ceiling - does anyone recognise this and have a suggestion for removal technique???

Thanks

[Dee J]

Vent axia solo plus. Been subject to loads of redesigns over the years. Still available. Can't remember how to get the cover off though.

[Adam2]

OK so there are 2 push release catches inside after pulling out filter. I found this after forcing the cover off ? At least the other one I need to replace will be easier