any advice on ipower 6inch duct booster fans (for cooltube only)

I found this listing on ebay for 6" Ipower duct booster fans. It comes with 2 in a case for $45.99 with free shipping and was wondering if these would be sufficient to use to exhaust a cooltube with a 400 watt HPS? they seem to be of better quality or I would never even think to try a duct booster fan because I made that mistake in the past but I went with the cheap ones. i am already going to be using a 4 inch inline fan and carbon filter for exhaust for the grow box (which is 2.5ft(L) X 2ft(W) X 3.5ft(H) ) and was thinking about getting another 4 inch inline fan to exhaust the cooltube and use a fan speed controller because i doubt i would need all of that just to exhaust a cooltube in such a small space. Just wondering if anyone has ever had any experience with these or just check out the listing and let me know what you think. here's the link:

http://www.ebay.com/itm/1-2-4-pk-6-Inch-Booster-Fan-Inline-Blower-Exhaust-Ducting-Vent-for-HPS-LED-Tent-/180933728607?pt=LH_DefaultDomain_0&var=&hash=item2a207d995f

You'll probably only need 1. With that small of a box you don't have any room for ducting, so your light will stay in 1 spot with the booster fan on one end and maybe a short piece of duct to connect to the port on opposite side of your box. I'm guessing you planned on putting 1 at each end, but I'd say that's overkill, but if the cost isn't important, go with 2. That's a pretty short box to put a 400w hid in, I'd like to see how it goes for you.
Happy Growing.

raven1290 said:

You'll probably only need 1. With that small of a box you don't have any room for ducting, so your light will stay in 1 spot with the booster fan on one end and maybe a short piece of duct to connect to the port on opposite side of your box. I'm guessing you planned on putting 1 at each end, but I'd say that's overkill, but if the cost isn't important, go with 2. That's a pretty short box to put a 400w hid in, I'd like to see how it goes for you.
Happy Growing.

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yeh I already figured it would be overkill as well. I also found a listing for 1 6" booster fan that looks the same with all metal fan blades with the same cfm rating that was $30 free shipping so I figured I would just spend the extra $15 and use the other on my intake or something because i would feel like I was getting screwed if I bought 1 for $30 when I could get 2 for $45. I am going to be using a the Lumatek 400/250 watt dimmable ballast so I am going to test run it at 400 watts to see how it does with temps and just run it on 250 if theres any problems until I eventually upgrade to my closet and make that box a clone/veg/ mother cab. i also did not think I would have the space considering most cooltubes are in the 20-24" range until I found an ebay store that sells a cooltube that's made for 250watt hps and lower and can fit the smaller 400watt bulbs. It's like 12" long which would leave me 9 inches of space on each side of the cooltube when it is centered. So that would give me a little more space for any ducting I would need to use. and like you said my light will stay in place so i won't be using much ducting. I just figured this would do for such a small length for the air to have to travel and I really don't have the room to add another 4 inch inline fan just for that. and I would have to get a speed controller as well for the sound so I would be looking at close to $100 which i really wouldn't be able to do right now and i need it soon because Im about 3 weeks into veg under 6 23watt (100watt replacement) cfl's. But I just wanted to get some input because i have never had any experience with the booster fans. Thanks for the input though bro.

I use a that same ballast, but my cool tube is 27" long. I use my 4" inline for my cool tube and my carbon filter in my 2x4x5' tent, so you should have no problems even when useing the super lumens setting.

raven1290 said:

I use a that same ballast, but my cool tube is 27" long. I use my 4" inline for my cool tube and my carbon filter in my 2x4x5' tent, so you should have no problems even when useing the super lumens setting.

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When I move everything to my closet in a few months im goin to get a bigger cooltube im just glad I found one so small so I can make everything fit for now. But those lumatek ballasts are bad ass I found one on hydrogalaxy.com for about $135 but I found a promo code for their site on google that was 10% off any order which dropped it down to like $121 with free shipping.