How about this fan for an EXahust?

Check this fan out

http://www.homedepot.com/Appliances...langId=-1&storeId=10051&catalogId=10053#specs


RUns 180 CFM, 6 inch wide.
Just take out the stand and flip it upside down and it would make a great exhaust, or at least i think it could. It would act and alook exactly like an inline. Just cut a hole at the top of my growbox and line it with anything really to avoid air/light leakage and reduce vibrations and sounds. Then the pencil case carbon filter over the output of course.

What do you guys think? My grow box is going to be 4x2x5 with a 150 watt hps (initially) and 6 40 watt cfls. i have 2 plants planned right now but i mght take on a third. Probably for my second grow ill upgrade to 250 or 400 watt hps system but for now 150 watt is what i can afford. You all think the fan could control that box pretty nicely even with a 400 watt hps? Its even got 3 speeds which is perfect so I can increase the CFM's as the HPS wattage and heat increases! I was even thinking of putting one at the bottom as an intake since its so cheap and efficient, but that might be overkill. I probably wouldnt even need an active intake, just a hole with that much power in so little space. or would I still?

So, if you were on a 200$ budget and didnt want to go the pc fan route, would you use it?

it would work to an extent but you would have to put some big ducting that fits over the full fan and caseing so you could filter the smell properly, doubt it would cool a 400 though, i think buy the time you add the duct and filter that the resistance would drop the cfm down much more than a inline,

something like this would be better than those http://www.htgsupply.com/Product-8in-Inline-Duct-Fan.asp

oh damn you can plug that in too....HTG supply understands the dilemma of stealth growers very much. I'll probably get that before i start my second grow or ill just get a second one of the fans i was looking. 2 185 cfms fans with filters should be fine to keep down the heat of a 250 watt.

yes 2 of those should keep a 250 cool, y don't you use the one in like to extract and one of those you found to circulate the air in room, good luck

Just get the inline fan. Find one on ebay for $60 or so and save yourself the headache. You dont want to skimp on exhaust.

or for $100 you can get this and run whatever size light you want.
http://htgsupply.com/Product-GrowBright-6in-High-Velocity-Inline-Fan.asp

the duct fans definitely dont do anything, even on a 250.. i was suprised.