Not all attic fans have ball bearings.
How to replace bearings in attic fan.
With fan off go into the attic.
Do this carefully and don t scratch the seals.
Replacement blades usually cost around 20 30.
Use a screwdriver and gently pry the bearings out from the motor housing seals.
Trouble shoot repair roof mounted attic fan.
The purpose of ball bearings is to make the fan run.
There are many replacement blades available on amazon.
Inside you ll find the ball bearing assembly and can evenly coat each bearing with the oil.
Once the fan is re installed run it at normal speed until the sound disappears signaling that the bearings have fully re oiled themselves.
So if your s doesn t you can skip this step completely.
Each half has two bearings one at the front and one at the back.
Tap the motor a few times with the handle end of a hammer or piece of wood as if you were swatting a bug.
Spray some lubricant wd 40 or similar into the air ports at the top bottom of the air holes in the fan housing for about 3 to 5 seconds.
It s a more affordable fix than getting a new attic fan.