My favorite bathroom fan to install without attic access is made by panasonic and called the whispervalue.
How to replace a bathroom vent fan without attic.
The best way to proceed with a bathroom fan installation with no attic is to run the venting duct between the ceiling joists and through a nearby exterior wall.
You might have to remove a few screws to get it out.
The bathroom exhaust fan should be attached to at least one ceiling joist.
When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form.
If your old fan wasn t attached to a joist and there is a space between the joist and the ceiling hole attach lumber to the joist to build it out next to the hole so the fan can be screwed to solid wood.
The ezfit fan is also more powerful and much quieter than typical fans.
Remove the grill cover.
To replace a bathroom fan all you need to do is remove the old fan and install a new one in its place using the same wiring and connections.
Remove your old exhaust fan.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
On the side of the hole opposite the joist attach a piece of 1x lumber inside the hole.
Begin by removing the screws on the cover of the old fan so that you can access the wiring.
These are easy to use and can be purchased at most home improvement stores.
Turn off the breaker box.
Use a circuit tester to ensure that the power is turned off.