exhaust

first closet grow want to try dwc but before i order anything do i need two fans.I would like to suck cool fresh air from under my house have filter in closet and exit out the roof.Will somthing like this http://www.4hydroponics.com/growroom/air2.asp?ItemNo=can-fan-combo do that with just one filter and fan.I have order some books and thanks to all that help.

will work but drawing from an un controled area like under a house is risky and Im willing to bet youll have pest issues alot. you can filter it but because is a dirt floor under there youll clog with dust very often. I have to change mine 1 time a montth and its inside. it ges filled with the natural dust floating in the house. now my room is 14 x 9 so Im using 465 cfm exhust with a 14in x 14in squar filtered opening cut into a wall....i use a simple furnace filter and it is always black a month later...hope this helps