UPDATE 3/17/2017 - I no longer own an Anet A8, I printed the parts and upgraded it, I tested it and sold it, it was only built to be sold. Therefore I cannot really provide much info on it. Except that it worked well!
I used screws that came with my Anet A8 kit, except for the pring blower fan, that I used M3 screws that I had laying around 20MM in length. But the fans all came with the kit.
The print fan is from this user:
The hot end fan is from this user:
I printed everything at .25 layer height with 15% infill except for the hot end fan duct, I printed that at 100% infill due to the thin walls and it came out great, very flexible and durable.