Cool Tube Fan Size?

pntrbl

pntrbl

Member
I have 2 400w lights in cool tubes and I need to buy an appropriately sized fan to cool them. My growbox is less than 4x6, from intake to exhaust should be under 10ft, and I'll probably run an elbow at each end.

For cheap I've seen this:

http://cgi.ebay.com/6-inch-INLINE-DUCT-FAN-exhaust-BOOSTER-vent-blower-cool-/390271852154?pt=LH_DefaultDomain_0&hash=item5ade03de7a

160CFM and assuming a 25% loss for length. elbows, etc. I'll guess it at 120CFM in the real world. Some math tells me there's just under 2 cubic feet in a 10 ft run of 6" ducting. Air should be whistling out a second after it enters. I would think that'd be enough.

It is listed as a booster fan tho. What that means I do not know ....

And I also see these:

http://cgi.ebay.com/6-ELICENT-INLINE-FAN-DUCT-EXHAUST-BLOWER-HYDROPONIC-/400083066422?pt=LH_DefaultDomain_0&hash=item5d26cf1e36

Lot more money.

Obviously I'd prefer the cheap one! LOL!

Anybody have an opinion on whether the "booster" fan will do the job?
 
[420]Haze

[420]Haze

Active Member
Fan size should be exactly what the cooltube end is, example, if you have a 150mm 600w cooltube, then you need a 150mm centrifigal fan, or use a reducer.
 
dbkick

dbkick

Well-Known Member
Oh !!!! its a hydroponic fan!!!!
6" ELICENT INLINE FAN DUCT EXHAUST BLOWER HYDROPONIC

 
dbkick

dbkick

Well-Known Member
but seriously that small mickey mouse one in the six inch pipe is weak, the other one would be nice to put inline with a carbon scrubber AND your light , kill two birds with one stone. If you don't think you need a carbon scrubber for some odd reason then I recommend something a little more solid than the fan you have posted . You can get those at home depot, go to a hydro store and look at some hydrofarm fans, fidy bux will put you in a 6 inch one that probably moves round 300 cfm. I had an 8 inch(460 cfm) hooked up to my 1kw hood and it stays cool as can be , I know you say you're working with cooltubes and I know nothing about those but I do know neither of those fans will serve your purpose well unless you're running a scrubber.
 
pntrbl

pntrbl

Member
Weedler said:
I have heard the booster fan is loud... What about an axial fan?
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Since I'm working with a shed in my backyard some amount of noise would be OK. We don't need a jet engine firing off out there but at least it won't be in the house.

Why is it called a booster fan? That would imply it ain't capable of working by itself. But if the motor spins and the blades move ....

I dunno.
 
pntrbl

pntrbl

Member
DB, Thanx for the info on your 8" fan cooling the 1000 watter. 800w is 80% of 1000w. 80% of 460 CFM is 368CFM. That's a start.

My brain thinks that due to the laws of physics, specifically the thermoconductivity of glass, that a cool tube would probably be more efficient than a hood tho. I got a buddy who blows glass, ya oughta see one of his dubble bubblers, lol, but he can get a section of glass silly putty red hot and be holding it in his fingers a few inches away. It's amazing.

And OMG, I just noticed the similar thread feature! I'll bet my answer's in there.

Thanx to all who responded. Gotta go.
 
Weedler

Weedler

Well-Known Member
pntrbl said:
Since I'm working with a shed in my backyard some amount of noise would be OK. We don't need a jet engine firing off out there but at least it won't be in the house.

Why is it called a booster fan? That would imply it ain't capable of working by itself. But if the motor spins and the blades move ....

I dunno.
Click to expand...
It is designed really to work in conjunction with another fan for longer runs to exhaust air. Buy a 6" with carbon scrubber combo package from Ebay and kill 2 birds with one stone like dbkick suggested
 
pntrbl

pntrbl

Member
Ahhh. The "booster" mystery is solved. If you have a room somewhere off in the corner of your house that doesn't get enough air you could install a booster in the existing ductwork. That makes sense and Thanx for that Weedler.

On the scrubber, while I'm sure I'll need odor control at some point, this particular fan will be pulling outside air in over the lights and right back outside. The air inside the box won't be involved.

But if I'm wrong please feel free ....
 
BeaverHuntr

BeaverHuntr

Well-Known Member
Can fans are pretty quiet ... I cool a 1000W HPS with a 675 CFM Max Fan..I use a 8'' Max Fan on a cool hood with a 6'' hole so you might have to spend 10 bucks on a reducer..
 
dbkick

dbkick

Well-Known Member
pntrbl said:
Hey guys, in the similar threads I found someone cooling a 1000 watts on a 20 ft run with a cheapo 6" duct booster. Post #5.

https://www.rollitup.org/grow-room-design-setup/168090-what-size-fan-1000-watt.html

The answer's always out there somewhere. Ya just gotta dig.
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Trust me, spend a little more money and get a fan that moves a little more air, the dude using the mickey mouse fan through 20 feet of flex and a 90 degree elbow has a lot of static and he's not getting the results he would if he'd have bought a higher cfm fan.
 
dbkick

dbkick

Well-Known Member
pntrbl said:
DB, Thanx for the info on your 8" fan cooling the 1000 watter. 800w is 80% of 1000w. 80% of 460 CFM is 368CFM. That's a start.

My brain thinks that due to the laws of physics, specifically the thermoconductivity of glass, that a cool tube would probably be more efficient than a hood tho. I got a buddy who blows glass, ya oughta see one of his dubble bubblers, lol, but he can get a section of glass silly putty red hot and be holding it in his fingers a few inches away. It's amazing.

And OMG, I just noticed the similar thread feature! I'll bet my answer's in there.

Thanx to all who responded. Gotta go.
Click to expand...
Radiant heat is really what you'll have to worry about in the end. cooling the light isn't a problem .
 
FeFiFoFUM

FeFiFoFUM

Active Member
I use a 4inch 190 cfm fan I got from ebay and it cools TWO 400w HPS cool tubes, I also have a 6in 409 cfm hooked up to a carbon filter for my tent.

I DIYed my cool tubes out of PYREX BAKE A ROUND tubes, they are about 3.5inches in diameter, and there is about 15ft of ducting it pulls through. works a treat really.
 
Weedler

Weedler

Well-Known Member
FeFiFoFUM said:
I use a 4inch 190 cfm fan I got from ebay and it cools TWO 400w HPS cool tubes, I also have a 6in 409 cfm hooked up to a carbon filter for my tent.

I DIYed my cool tubes out of PYREX BAKE A ROUND tubes, they are about 3.5inches in diameter, and there is about 15ft of ducting it pulls through. works a treat really.
Click to expand...
I did this about 6 years ago on my first grow then had to stop after only 1 harvest :( Seeds have been patiently awaiting their turns lol

I use the same 4" 190 CFM hooked up to a carbon filter combo. It is barely enough to cool my 400W tent I should really be running a cool tube on it. The 250 is like 5 degrees cooler than the 400W same exact setup
 
dbkick

dbkick

Well-Known Member
Weedler said:
I did this about 6 years ago on my first grow then had to stop after only 1 harvest :( Seeds have been patiently awaiting their turns lol

I use the same 4" 190 CFM hooked up to a carbon filter combo. It is barely enough to cool my 400W tent I should really be running a cool tube on it. The 250 is like 5 degrees cooler than the 400W same exact setup
Click to expand...
your problem didn't come in cooling the light, the fan, unless it was centrifugal can't deal with the static a carbon filter creates. A 190 cfm fan would more than likely cool a 400 watt light , at present I have taken my 8 inch 450 cfm inline fan off my light amd replaced it with a 4 inch centrifugal fan with a cfm rating of around 130 . When I had the 8 inch fan on the light the hood stayed cool as can be, with the 130 cfm centrifugal fan (which deals with static well) the hood isn't hot but it is warm to touch.
 
Weedler

Weedler

Well-Known Member
dbkick said:
your problem didn't come in cooling the light, the fan, unless it was centrifugal can't deal with the static a carbon filter creates. A 190 cfm fan would more than likely cool a 400 watt light , at present I have taken my 8 inch 450 cfm inline fan off my light amd replaced it with a 4 inch centrifugal fan with a cfm rating of around 130 . When I had the 8 inch fan on the light the hood stayed cool as can be, with the 130 cfm centrifugal fan (which deals with static well) the hood isn't hot but it is warm to touch.
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Maybe I was unclear? I don't have a cool tube for the 400W tent just an open reflector, to get temps perfect I should install a cool tube. I have built cool tubes like mentioned above with Pyrex but only have open air reflectors and extracting hot air out of the top of the tent through a carbon filter then out of the room
 
FeFiFoFUM

FeFiFoFUM

Active Member
Weedler said:
Maybe I was unclear? I don't have a cool tube for the 400W tent just an open reflector, to get temps perfect I should install a cool tube. I have built cool tubes like mentioned above with Pyrex but only have open air reflectors and extracting hot air out of the top of the tent through a carbon filter then out of the room
Click to expand...
nah I understood you perfectly clear man lol

But Im also not a KNOW IT ALL DICKHEAD
 
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