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It’s likely 4”, most are in my experience unless someone’s really gone for it. If you have a white or chrome or whatever visible plastic fan then measure it, if it’s a bit over 10cm it’ll be 4” and if it’s a bit over 12.5cm it’ll be 5”.
If you turn off the electricity to it you can easily take the front off and see the fan and measure it.
t.o.
Any tips for replacing a bathroom fan? Is there an easy way to measure the opening diameter before you remove the existing one?