Our greenhouse, which is in the process of being put together again, had a triangular panel for above the door with a spinny air-vent-fan type thing in it.

I say "had", as it decided not to stay where it was put when it was put back in place, fell, and broke.

Any idea where I'd get a new one? Are they the kind of thing everywhere'll have, and I'm just not using the right search terms? Or am I resigned to glueing my fingers together with superglue in an attempt to fix the thing...

Thanks in advance!