I have need of a 6" fan that will provide about 230 CFM of air movement for venting a small grow tent. I don't like duct booster fans, and neither do I want to use a fan speed controller.

Would a 6" 240 CFM Axial Fan be OK to use? It's listed as a "Greenhouse Fan" on Amazon.

http://www.amazon.com/EcoPlus-6-Inch-Axi...d=ATVPDKIKX0DER

I think that you will find that when you put ducting on that that it will make the 235 cfm about 100 cfm or less. Fans like this cannot take much resistance at all and you are going to need at least a couple of bends to make a light trap.

What is your problem with a fan speed controller?

Well, I'll be hooking this fan to the exit path of a weak bathroom fan. I actually removed the bathroom fan and am trying to hook up a stronger fan for more venting.

I have a small 32"x32"x60" tent inside a small bathroom. I wanted to run 6" ducting straight out the top of the tent to the bathroom fan pathway, and attach the new fan itself to the ceiling, pulling air from the tent and pushing it out the bathroom fan pathway..

The 6" bathroom fan pathway probably cuts down to a 4" pathway somewhere inside the housing, if my fan is the same as the ones I've seen online.

I wanted to try and get away with using as light a fan as possible. And to avoid the extra expense of a fan speed controller. But I'll do whatever I have to do. It's getting hotter every day up there. And it'll be time to flower soon.

Yea, I've had to use my window ac unit for about a month now. But Mine is in the garage where yours is inside probably controlled temp with central heat and air.

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in my PC overclocking days, I played with a LOT of axial fans

any axial fan that small moving that much air is going to be LOUD
hair-dryer loud

Why not just an inline 4 inch fan set up exactly as you say pulling tent pushing duct ?

Quote: surfinc wrote in post #6

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Why not just an inline 4 inch fan set up exactly as you say pulling tent pushing duct ?

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Oh, there are PC fans that do put out higher than your average axial pressure...

"twin" (one 5 blade, one 3) , counter-rotating 120mm Delta Monsters




220 CFM @ 15 mmH20 and 59 db

but the controller needed to tame the 12V DC amps these things draw isn't PC "friendly"
got a spare PC PSU ? (PowerSupplyUnit)


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http://www.northerntool.com/shop/tools/p...CFUVqfgodfC4Alw

59 db generator....

well my friend i use three 12V 3.3A high speed winds of fan violence.fans in my 2..5 x 2.5 x5.3 tent . i run a a 400watt hps/mh digital cooltube with full reflector and a 4x10 carbon.i put two fans on both ends of the cooltube and the other down in one of the bottom air solts the tent haves i use a 500 watt computer power supply to all the fans. it handles the load very nice but once you add more then three of these fans the power will start to drop for all fans add a 5th and the fans will not start. my temps 60's lights out 75-80 lights on i hope this helps these fans work if you use them in the right way.

well my friend i use three 12V 3.3A high speed winds of fan violence.fans in my 2..5 x 2.5 x5.3 tent . i run a a 6in 400watt hps/mh digital cooltube with full reflector and a 4x10 carbon.i put two fans on both ends of the cooltube and the other down in one of the bottom air solts the tent haves i use a 500 watt computer power supply to all the fans. it handles the load very nice but once you add more then three of these fans the power will start to drop for all fans add a 5th and the fans will not start. my temps 60's lights out 75-80 lights on i hope this helps these fans work if you use them in the right way. you can see the wire from the fan hanging down in the pics . as you can see nice light cover over the tent. i have been growing from 2005 until now and i have only used pc fans and box fans in my grow areas