500cfm fans $36

anybody been to smarthome.com they have 500cfm inline duct fans for like $36 bucks too good to be true or what?
8-Inch 110VAC 500CFM In-Line Duct Fan - DB208 - Smarthome
check it out

looks like its made of plastic and will fall apart when you turn it on lol

thats a booster. its designed to boost 500 cfm fans and will not move 500 cfm by its own accord.

Wonder what they mean by booster fan or how much air it does move, that would perfect for all those that have closet grows and don't know what to do. They could get the 4 inch one and use the standard flexible duct to connect to it since it is an actual piece of duct, I was thinking about doing the same thing except using my own fan.

I'd think it would be worth a try, heck I'd probably hookit up to a thermostat in the room and have it kick on at 75 degree.

Those duct boosters supposedly work fine, from what I've READ, not personal experience but most people seem to get the ones at home depot etc. I don't know if that's a good deal after shipping compared to local or not. Duct boosters are not expensive like real can fans are.

If you have short ducting I am pretty sure this would be fine, but who knows if it's loud or will last.

who knows if it's loud or will last.

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I thought I read it was supposed to be silent.

I didn't know they made such a thing I might go to the store around here and see if the sell such a thing, I am definitely in need of a ventilation upgrade, Rock on !!!!!

Might even go with a 4" to a 2" pvc pipe and run it to my sewage system, then I'll be getting closer to being ranked as a pro !!!!!!!

Regardless of what people said in this thread, I would purchase it just to see. It very well could be an awesome product- If you buy it please let us know how it works out.

OregonMeds said:

Those duct boosters supposedly work fine, from what I've READ, not personal experience but most people seem to get the ones at home depot etc. I don't know if that's a good deal after shipping compared to local or not. Duct boosters are not expensive like real can fans are.

If you have short ducting I am pretty sure this would be fine, but who knows if it's loud or will last.

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Duct boosters DO NOT work fine, this from what I have personally ascertained, not from what I've read. I bought the 8" fan at HD (Exact same one as in the link). They will keep moving air moving, provided that there is NO restriction anywhere. The motors on them do not have enough torque to overcome much resistance or to move a significant amount of air on thier own. They all have a rating of how much air they move at a given static pressure (.000in, .025in, etc) This one moves 500cfm of moving air, but wont move 200cfm of still air on it's own. I would think that you could use them in a cool tube type application to cool a light, but again, you gotta watch any restrictions in airflow.
I had mine sucking air from the area above my lights and venting it under the house. It would not even create a negative pressure in the room. (no airflow/suction into the room under the door)
They might well work to cool lights (cool tubes) but as a room air exchanger they suck miserably.

La9, you cannot go from a 4" line to a 2" line with this kind of fan. You need a way more powerful motor behind it if you plan on restricting air flow. I had mine set up as an 8" inline fan on 6" duct. Farts move more air than one of these.

Best advise for real ventilation is go with a "squirrel cage" type blower fan. Here is the one I found used. Mine is wired for 120v, but it's the same model. Over 2000 CFM at pressure!!! That translates out to 2 complete air changes in my room per minute. Air flows INTO the room under the closed door, eliminating odor in the house. I had to add some intake vents to allow for free flow of air.

http://www.grainger.com/Grainger/items/7D630

They are high dollar if you buy new, but you should be able to find one used. I got one that almost implodes the room (Windows flex in, and ears will pop when it kicks on) that was used as an air exchange fan in a paint booth. I tinted the windows on dudes car for it. It's fucking HUGE, but really quiet considering its size. You cant hear it from outside the room. I had to do some south african engineering to connect it to the ductwork, but this sucker will straight up MOVE some air. Pics available for anyone who wants. I know it's big and probably overkill for a closet or stealthbox grow, but Grainger has about 400 blower fans to choose from. And a blower fan is most definately called for here. Just be sure that the rated CFM is not at 0.00in static pressure. The higher the static pressure the fan is rated, the more air it will move on its own. 500 or 750 CFM (0.00in) sound good until you get it home and find out it wont do shit at pressure.

i use a 6 inch duct fan from htg for 26 dollars to coll my euro hood and 400 watt hps in a $x4x6.5 tent with passive intake and that it. Imight just be lucky but it works just fine. I keep the temop of the tent almost to a degree the same as outside. 85-78 usually. I want more but maybe another cheap one of those i be happy. Hell it's summer now. Howver the temps do occasionaly rise so if yu need real power or can afford it, i cannot (rich in spirit) buy a real inline. Ebay always rocks!

The problem with those fans is that 1) they don't pull anywhere near the CFM that they say; and 2) they don't have much ability to handle backpressure or suction and too much of either one will burn out their motor. That doesn't mean they don't work. If you've got a big intake area, then their motor won't get too strained. Obviously, they won't work well (or for long) with a carbon filter. But they are cheap, which is a plus. If you fry the motor, well, at least it won't have cost you a lot.

lol, yeah with a carbon filter i wud spring for the bigger fan, or at least a package deal. That's right.

I saw something like this at Home Depot. It was a six inch inline fan. I thought about getting one and venting through my clothes dryer exhaust. Any thoughts on that plan?

i use them and they work fine i just dont use that much restrictions and you will be fine

those booster fans blow the amount of cfm not draw. just like pc fans. not verry accurate. but if thats all you can find then it will have to work.
look for a used fan. i got a 450cfm elicent fan worth about 4 to 500 bucks for 80 bucks. i`ve used it for a year so far and is verry good and quiet

Don't bother with the 6" at HD get the 8" for $6 more it moves a lot more air and is quieter during operation.

Ya know guys, right on that page it says 500 CFM as booster and 215 Free air. Thats more then a 50% reduction.

BigBudBalls said:

Ya know guys, right on that page it says 500 CFM as booster and 215 Free air. Thats more then a 50% reduction.

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And that 215 cfm free air is for an 8in fan, moving air thru a smooth 8in duct. ANY resistance whatsoever will drastically reduce the cfm it will move. I'd say they'd be OK for hood ventilation, like with cool tubes or something, but if you are looking for a complete air exchange every so often, this aint the way to do it.