The ezfit fan from nutone model ez80n replaces both the fan and housing and can be installed from the bathroom without having to go into the attic.
How to replace a bathroom vent fan without attic.
Turn off the breaker box.
Use a circuit tester to ensure that the power is turned off.
The bathroom exhaust fan should be attached to at least one ceiling joist.
Remove the grill cover.
Bathroom exhaust fans perform an important function by removing excess moisture from your home.
Remove your old exhaust fan.
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.
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.
On the side of the hole opposite the joist attach a piece of 1x lumber inside the hole.
Determine where the ceiling joists are and do not cut into the joists for any reason.
Begin by removing the screws on the cover of the old fan so that you can access the wiring.
If the metal housing doesn t fit you may have to secure some additional wood to the joists so that housing can be installed securely.
You might have to remove a few screws to get it out.