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Heat, at wits end...

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PuravidaC

New member
This may be a little long winded but I want to explain my set up so you guys have a better picture of my issue. I have a small grow space, 2.5' X 3.5' X 6.5' (57 cubic feet), a 315 LEC light with two passive intakes close to floor and a 6" Vortex exhaust fan (340 cfm) near ceiling. I also have a 12" oscillating fan and two additional 6" clip on fans for air circulation. My issue is temperature at plants directly under light is 10 degrees hotter than temperature at top of grow space. My humidity to 20% higher at top of grow space than at bottom of space. With that much air movement how can there be that much of a difference in temperatures/humidity in such a small space? I am currently using 6" clip fans to push cooler, moist air toward the bottom of grow space and oscillating fan pointed towards light to dissipate heat. Could I be creating a vortex that is preventing air from mixing properly???
 

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Morning PuravidaC, Good to hear from you, been awhile.
Have you still got negative pressure, does your tent still suck in with all those fans.?
 
I don't know if this would help but I have one of these suspended from the ceiling of my tent and it hangs down and "oscillates" back and forth. I think it is helping keep the temps more constant in the tent from top to bottom.

I'm using 2 315 LEC's in a 4x4x7 tent and need 2 6" exhaust fans and filters.
Temps have been staying around 78° F with small humidifier running with lights on and RH about 50%
 
Secret jardin monkey fan 6.6inch ossiclating fan only one on the market it’s a clip on post fan not a shitty clip fan. Just watched a video of the Holmes fan the ossiclation is really fast the monkey fan slows way down and has a nice sweeep. Best grow fan ever for revoking packets of stale air basically my whole issue last summer
 
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I use a isolating tower fan to disapate heat. With that gauge on the soil I beleave it’s reading the soil moisture no the air. Hang the gauge over the grow to get proper readings, temperature as well as humidity Lol
 
Hey DAAS! I built my own grow space with plywood, not a tent. When I upgraded to a 6" exhaust fan I cut another passive intake hole to help with additional cfm exhaust. The negative air pressure is less but I can still feel slight negative air pressure when I open and close door.
 
Insight, I may have to try reversing fan locations. Maybe mount osculating fan near top of space pointed down and use clip fans to blow over and under canopy. The more I upgrade, the more problems I create!
 
It's hard for me to grasp there isn't enough air movement in my small space with 6" exhaust fan and 3 additional fans for circulation. Thought for sure I had everything covered!!
 
Hey PuravidaC, ain't that the f-cking truth.
I love the way my 315cmh makes hard buds, but the heat can be he'll sometimes,
Make me think I should have bought a couple of 3-4 cob lights instead of the 315cmh, especially in summer grows,
 
Potted, I usually do mount gauge at top of plants but at seedling stage I did place gauge on soil. I give seedling very little water at this stage so majority of soil is dry and I agree that could throw off humidity readings but temps??? Light is 24" above plant.
 
I know your telling me I had 4 clip fans and a box fan and 2 6” in-lines and I did not have enough air flow still I started to really look at things but the monkey fan made all the difference no more stale air. I have a intake in-line fan and exhaust. I have 3 total 1 for each tents exhaust and one for intake split between a T to both tents. If you wanna check where the stale air is or your air movement use an incense or joint 😃. This will help you read the air and how it is moving around the tent. Took me a year to get my environment straight.
 
In the photo it looks like the exhaust air is being blown back into the grow room. If this is the case it needs to be exhausted out of that room. Best case is that the fan intake would be up high in the room to remove the hottest air.
 
I intake cool air in the bottom of tent pipe facing into a fan moving the air through out the tent and exhausting the hot air out the top. The hot air naturally rises so it just makes sense. Plus my lights don’t generate a lot of heat all the heat come out the top of the light. The heat is not a lot the underneath of my lights is as cool as the air. This is the benefit to led lighting how the light is cooled and how much heat it generates which is I would say is less that a 4 bulb t5
 
Hey PuravidaC, in hot weather I leave my tent door open, sometimes.
But I'm growing autoflowers, so that doesn't matter. But you sure need to try to keep your temps under 82 if possible. You can go even hotter using Led lights though, 84-86, with out trouble. Or without co2.
Good Luck PuravidaC.
 
DAAS, my temps at plant has been 81, but jumped to 86 yesterday for no apparent reason but back to 81 today. Temps at top of grow space is 72... It's got me stumped!
 
Hey PuravidaC, I remember that, I hope I didn't influence you on your purchase.
Are your exaust lines, straight and not stopped up ?
That is puzzling.
 
Yeah, I thought about checking negative air pressure with incense and could try inside to check air movement but space is pretty tight! That's as big as I could make grow space and keep it stealthy. I also wonder if small space is causing issues with dissipating heat, larger cubic footage allowing more area to distribute hot air.
 
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