I use an air blower to dust the inside of my PC every few months. I keep the PC fans from turning when doing this to avoid turning them into dynamos and possibly causing damage to the electronics. I've been using this technique for years without problem as it's easier and cheaper than compressed air.
However I've heard that this might cause problems because apparently the friction caused by the air can create static electricity. This somehow is not a problem with compressed air cans.
Is there any truth in this?