HUGE heat issue Need help fast

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emjikay

Well-Known Member
Okay so my grow space is done, its small (3 tall by 3 ft wide x 14 inches deep) I have 14 cfl's in there (mostly 30w and 23w, but also 2 40w's). My intake fan is a computer fan and outake is as well. I have another computer fan blowing around air inside of the box to try and cool it down. The Walls are all covered with mylar.

Now i just tested it and left my lights on for 10 minutes in the box with a thermometer, and the temperature when i opened the box was 98!!!!!!!!!!! I can't vent the hot air to the outside as i dont want to drill thru walls, its a stealth grow so moving the box to another room could be done but i prefer not to. What should i do to lower my temps???? Thanks for the responses
 
Butthead08

Butthead08

Well-Known Member
You could always try putting more fans in. We had 4 computer fans in ours, and we only had 3 CFL's in there... Or if you could put it near an air-conditioning vent, that could work too I suppose.
 

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emjikay

Well-Known Member
the nearest air conditioning vent is in the hallway and if i moved it out there it wouldnt be so stealthy haha. Hmm so u recomend putting more computer fans in??? I know i have a lot of CFL's in a small space but damn that is a high temperature.
 
Butthead08

Butthead08

Well-Known Member
sorry, added photos. more fans, and sometimes a frozen water bottle could help you as well. they're hard to keep up with though, they melt so fast. we had a temp issue as well in our grow space, but now everything's good with a few fans and a "cool-air" humidifier we found at walmart.
 
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emjikay

Well-Known Member
ill go take a few pictures of my setup for you guys in like 30 minutes im gonna go out. THANK YOU GUYS SO MUCH for these responses its really helping i really apreciate it
 
iloveit

iloveit

Well-Known Member
I have only one question: HOW ARE YOU POWERING THE PC FANS?

I want to do the same but without connecting 12 batteries. Please tell me how
 
drdawson

drdawson

Active Member
I would swich to a passive intake and get all possible fans venting air out.

remember, with one 50 cfm fan is going out and one in, then the overall cfm moved is 50 cf.

but if both are turn facing out and a passive intake is there then the overall movement of air is 100 cfm.

'''Lights a joint'''..................
 
drdawson

drdawson

Active Member
iloveit said:
I have only one question: HOW ARE YOU POWERING THE PC FANS?

I want to do the same but without connecting 12 batteries. Please tell me how
Click to expand...
I got a 12 volt adapter and wired them up on a parallel circuit. Its really easy you can have as many as the wire will allow.
Merry christmas

p.s what day is it.

p.p.s im baked right now
 
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emjikay

Well-Known Member
one of those chunky chargers that take up hella room. u cut the wires and plug em into the fan and wallllah
 
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T.H.Cammo

Well-Known Member
desertrat said:
sounds like waaay more light than you need - this site quotes 40 watts/sq ft.
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Oh, really? Where did you get that? 40 watts/sq. ft. is a little on the puny side, even if it is HID lighting, 50+ watts/sq. ft. is a better number to shoot for (with HID's)!

For CFL's you best shoot for something like 75-80 watts/sq. ft. (even 100+ watts/sq. ft. is realistic).

The amount of watts you need is determined by the efficiency of the type of lights you are using (they are not all created equal).
 
desertrat

desertrat

Well-Known Member
T.H.Cammo said:
Oh, really? Where did you get that? 40 watts/sq. ft. is a little on the puny side, even if it is HID lighting, 50+ watts/sq. ft. is a better number to shoot for (with HID's)!

For CFL's you best shoot for something like 75-80 watts/sq. ft. (even 100+ watts/sq. ft. is realistic).

The amount of watts you need is determined by the efficiency of the type of lights you are using (they are not all created equal).
Click to expand...
you're right, bad math converting lumens to watts. 50 watt/sq ft as the minimum, more is better.
 
dos lunge

dos lunge

Active Member
You should take some of those lights out bro. The plants might grow slower with less light, but they wont grow at all with temps up to 98. Go ahead and keep at least 1 CFL per plant right on the tops of the plants and maybe one or two lights placed strategically around the box for the lower branches. You should also get those things a little closer, you can put them about 2 inches from the plant without too much drying out, especially if your not using the massive 100 watt cfl.
 
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HotNSexyMILF

Well-Known Member
One cfl per plant is laughable... the harvest would be worthless... get more fans.. only take out lights if you've exhausted all other options..
 
AquafinaOrbit

AquafinaOrbit

Well-Known Member
You need more CFM. Typical 80MM fans are probably only pushing around 30CFM, while higher end ones like a Delta can push around 100+. I would personally go 120mm as they are lower in noise (dba) and higher in CFM, or just get some desk fans from walmart. Also a fan inside the box just blowing in could create a deadspace (Air that conflicts with another flow and thus does not move) I would go with a normal computer design and have intake on one side and outtake on the other.
 
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