Get a plastic editing tool like a Dremel with a small cutting disc make a cutout for the fan but make it a bit smaller than the fan so that you can use the screwholes of the fan.
@BigOnYa, when your wife kicks you out BOVONO Prefabricated Tiny Home, Mobile Prefab House with Lockable Door and Window, Outdoor Storage Shed with Restroom & Cabinet, Perfect for Hotel, Kiosk, Booth(19 x 20FT) https://a.co/d/ab1dd5t
@K3Nv2:
@BigOnYa, when your wife kicks you out BOVONO Prefabricated Tiny Home, Mobile Prefab House with...