I just got a sunleaves windtunnel fan, I got the 4" 200cfm, its made of plastic and it is QUIET! Also it'd work with that tent since it's 4", it's the highest flowing 4" fan I found, and for that tent 200cfm with be plenty!
Oh and get a phresh filter...
Finally all the hard work of building this bad boy is over! Room is a little over 4'x3'.
Setup:
4 Bucket Recirculating DWC
600w Lumatek w/ Digilux MH/HPS in an A/C Refletor
200cfm Sunleaves hooked up to a Phresh Filter
4x3'~ Scrog
Box Fan for under cannopy circulation, gonna get an oscillating...