Check the housing duct size before even purchasing a new bathroom exhaust fan it may be a good idea to remove.
Replacing bathroom exhaust fan without attic access.
However it is not a big deal.
Because you can do everything related to replacement underside.
Once all this is done take hvac tape or a clamp and attach the duct connector.
What to consider before replacing your bathroom fan.
Wall switches for new vent fan if you want the new exhaust fan to use your old switch then no more.
Not having attic access seems problematic to some people.
Installing a bathroom fan without attic access mounting your new bathroom exhaust fan.
Video tutorial on how to replace your bathroom exhaust fan in 5 minutes or less.
For this reason they ask how to replace a bathroom exhaust fan without attic access.
Attach the duct connector to the duct.