I am building a dust mask for wood turning using a 12volt brushless computer fan and a battery from a cordless drill. The fan forces air through a filter onto the inside of my face shield. The first try worked very well using a 12v power supply but the AC power cord to the rig was a pain , hence the 20v lithium ion battery. Worked great for a few days ( fan was quite a lot faster ) but I think I burnt out the motor with the higher voltage. Trying again with a 14.4volt battery. Will the 12volt motor tolerate the 14.4 volts? Thanks for taking the time.