so I don't know, just guess:
If you put two of these blowers (each has 30 watt) inline between airbox and heater I can imagine, it will pull out the hair rapidly out of the air box. I don't know if then is enough air left for cooling the engine or it might cause a engine overheating. ...just thinking out loud.
the other thing is, do you really want to see them each time you open the engine lid? hm