@AmberTrichome
12x11x8= 1056 cubic feet per minute or
63,360cubic feet per hour
Thats 1794m3 per hour
So you need a fan that can move that much air- if your running a carbon filter to you multiply that again by 1.33 that equals
Thats 2386m3
So your talking about a high end 12inch fan
They get quite expensive over the 8 inch size though dude so might be cheaper to buy two smaller fans that can move around 1000m3 each