what fan for a 400w cool tube and where to exhaust

[anth0sWart]

I a 400w is fitted with a home made cool tube consisting of an inlet at one side and outlet at other using a bake-around, What would be the best kind of fan to use? also where should it be exhausted to?

cheers

[stickygreenlightsabr]

http://boards.cannabis.com/showthread.php?t=34789

Check out the inline duct fans: http://www.discount-hydro.com/ventilation.asp