Those S&P's look pretty decent. Home depot has a cheaper version($25-30 and not adjustable) in their ventilation section that I'm using(4" 80cfm) on a 2x2x4 box with a 200w cfl. That keeps the temps at 90 with room temp around 80, might have to go with the S&P upgrade/addition as the box simply can't hold the huge size of other inlines like vortex or can-fan.
redtails Reviewed by redtails on . Quiet Fan Who makes the most quiet fans? and not too expensive? Rating: 5