Yeah, the tiniest pine needle or whatever will act like the old playing-card-in-the-spokes trick. Annoying but meh. Sometimes it works itself free. ...sometimes.
Click the readme on my sig. Pick a manual and drill down.
Vehicle Interior > HEATING / AIR CONDITIONING > FRONT BLOWER MOTOR
Easy peezy.
Disclaimer: linked manuals are not mine and could go stale any time. Read it while you can.