The tinfoil is wrapped around pieces of thin cardboard to help the air flow, there is also an air dam inside the fan duct separating the two fans. The Two intake fans I got from www.frozencpu.com
Here.They are running at 12v right now and the fans themselves aren't too loud but right now they are rubbing against the bottom grill, but I will be fixing that with a little shaving.
~Shoe