Just discover that my fan at the rear became very slow speed. Thinking of buying a new one.
When I arrived the store, there are many different fans of different speed.
For example, 8000rpm, I can merely feel some slow air movement next to it. 10000rpm, it started to have some wind. 15000rpm, the wind is quite fast and I am contented with its speed. 20000rpm, it is really fast. You can dry your hair with it.
But do I need such a fast fan? To clarify it, what is the setup which may create so much heat which I need a very fast fan to blow them off? Is 8000rpm enough?