T wrote:

Tip: If your fans are noisy, blowing them out won't help
things. It is time to replace them.

Not wholly correct. If the fans are dusty, especially due to the caked
on dust due to impact, and because the air is not filtered, the fan can
get out of balance with dust and grime. This isn't dust floating and
settling due to gravity. It's dust slamming into fan blades, and dust
is not clean. It will stick.

Even a new fan will vibrate if it is unbalanced. After blowing out with
blades/hub fixed, use an ear swab to scrub the blades on front and back
to dislodge the caked on dust. Then blow out again. Blow, scrub, blow
again.

I don't remember hearing of anyone using an air compressor to dust out a
computer. They sell compressed air cans for that.