boosting duct booster fans

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Greggl4321

Active Member
So I've got a duct booster fan, but due to the solize of my enormous tent I'm unsure if my duct booster fan will have enough power to cool my 600watt and make it out the window. I believe my tent is 4'x4'x80".

Basically I need a sengment of tube that goes about halfway down my tent, and then another 4 to 5 feet out with the window.

I'm gueewing I'm looking at a 9' to 10' duct tube with a few bends in it. Do you think a 6" duct fan will blow harder enough to make it through there?

Is there a table I could use to see the cfm drop off with length and bends?
 
Richard Drysift

Richard Drysift

Well-Known Member
Never seen anything like a chart but all you need is to do some easy math. First of all keep your ducting as short and with as little bending as possible. The longer it is and the more accordion like it is the more heat it will radiate back into your grow tent. 6" should be fine; no need to get 10" ducting. Your grow tent is kinda on the large but I vent out my 10 x 7 x 6 space with 6" ducting and a 440 cfm fan.
What you want ideally is an inline fan that will replace all of the air in your tent in about a minute or faster. Exhaust fans are rated in cubic feet per minute so if you calculate the cubic footage of your area & convert inches to feet (80" = 6.6')
4 x 4 x 6.6 = 105 cu ft
If your inline fan is rated at 105 cfm or higher then you should be good. Personally I think you are better off getting a fan a bit more powerful fan than you need and then add in a speed control to adjust as needed to keep negative pressure without sucking in the sides of your tent too much.
 
Dopaw13

Dopaw13

Well-Known Member
just in case you are cheap and a DiY guy i got an old 12v Motorcycle radiator fan and wired it to a 12v 5a laptop supply for my exhaust i havent measured the cfm but i used it in a 2.4 x 4x7 tent worked great kept temps at 70 with 2 big t5 HO fixtures in there
 
PetFlora

PetFlora

Well-Known Member
~ 5 yars ago a compnay was selling passive inserts that went prior to the intake and inside the intake air tube

The idea was to vortex the air making it more efficient mixing gasoline. It might be better suited to ducting hot air
 
TurboTokes

TurboTokes

Well-Known Member
I use a 6" booster fan no problem at all with a 600hps in an enclosed hood.

Quality will likely have something to do with it, I would say mine is higher than average quality, but only cost about $45 and moves over 300cfm. I have mine connected to a an speed controller and usually keep the fan about 2/3 strength, its very quiet, unlike the "specialty" inline fan that make a ton of noise and give your grow away to anyone in ear shot, the booster fan is quiet.

Ive had mine running about a year now non stop 24/7, zero issue, my exhaust run is only about 7feet though, but even when I ran it with a 20foot line (to use the heat to warm the house in winter) I noticed no flaws from the booster.

I could see the booster possibly not being enough fan if you werent running an enclosed hood / cool tube, but that would have to be tested.
 
Budley Doright

Budley Doright

Well-Known Member
PetFlora said:
~ 5 yars ago a compnay was selling passive inserts that went prior to the intake and inside the intake air tube

The idea was to vortex the air making it more efficient mixing gasoline. It might be better suited to ducting hot air
Click to expand...
Maybe better for fuel injection but all it would do is provide resistance, not a good thing for ventilation lol.
 
Budley Doright

Budley Doright

Well-Known Member
TurboTokes said:
I use a 6" booster fan no problem at all with a 600hps in an enclosed hood.

Quality will likely have something to do with it, I would say mine is higher than average quality, but only cost about $45 and moves over 300cfm. I have mine connected to a an speed controller and usually keep the fan about 2/3 strength, its very quiet, unlike the "specialty" inline fan that make a ton of noise and give your grow away to anyone in ear shot, the booster fan is quiet.

Ive had mine running about a year now non stop 24/7, zero issue, my exhaust run is only about 7feet though, but even when I ran it with a 20foot line (to use the heat to warm the house in winter) I noticed no flaws from the booster.

I could see the booster possibly not being enough fan if you werent running an enclosed hood / cool tube, but that would have to be tested.
Click to expand...
Can u post a pic of it?
 
MichiganMedGrower

MichiganMedGrower

Well-Known Member
A duct booster fan is only designed to help a furnace fan reach far away rooms in a large house for instance.

They are not designed as a main cooling fan at all. They do not push the cfm rated unless the air is already moving.

An inline fan is made for the purpose here.
 
Budley Doright

Budley Doright

Well-Known Member
MichiganMedGrower said:
A duct booster fan is only designed to help a furnace fan reach far away rooms in a large house for instance.

They are not designed as a main cooling fan at all. They do not push the cfm rated unless the air is already moving.

An inline fan is made for the purpose here.
Click to expand...
That's why I wanted to see the one turbo uses, I've never had good luck using them as intended lol. They are typically Loud and don't move shit.
 
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Greggl4321

Active Member
The duct booster fan is definitely moving air, the thing is though that you have to idea an opening for air to get in. It'll definitely push through 10, likely 15 foot of 6" ducting.

I recommend to everybody to go with duct booster fans. They are significantly cheaper, quieter, and don't really need speed control unless you wanna be absolute stealth(?)
 
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