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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DIY grow space 2.5' X 3.5' X 6.5'
315 LEC
6" Vortex exhaust fan w/speed control
6" Carbon filter
3- 6" fans
humidifier
temp and humidity gauge
5 gal smart pots w/ FFOF soil
FF trio nutrients -
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.?Cfls for a week or two
315lec for everything else
Dug up Ms.topsoil, with perlite added
36x36x63 inch tent.
6inch - exaust - intake fans an scrubber
Smart pots
Molasses
Autoflowers -
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%
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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 D.A.A.S.69, It's all you and Greene's fault!! 😉 Plus local hydro store had a 315 set up and I was amazed how little heat it put out. I really wonder if my grow area is too small for 315 but I see others here with similar set up and no heat issues... gonna take Insights suggestion to relocate fans.
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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 summerLast edited by Inuart88; 05-05-2018, 09:31 AM.Comment
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I wondered if I had created an environment that trapped hot air lower in the room. That was my reasoning for small fans pointed down, to help move cool, moist air at top of room to circulate downward and help air movement. If I do add a fan for intake should it match cfm of exhaust fan? Seems to me if it doesn't I would restrict air intake. Make sense?? I added another passive intake when I upgraded to 6" exhaust fan (80 sq inches total) to help 340 cfm exhaust fan hit it's full potential, or so I thought.Current fan locations is creating so much air movement that light is swaying slightly! My current temps at canopy are acceptable for veg (81 degrees) but I worry about flower when I install carbon filter, which will decrease cfm of exhaust fan, currently running full speed. -
I think with the way your air flow is right now is trapping the air. Adding a intake fan would make sense and I would usually just buy two of the same fan. Also you can turn them down the recommended air exchange rate in a marijuana grow room is exchange there 1 every 3 minutes which you could dump 4 times a minute almost. Tour trapping your hot air at the bottom your not moving cool air low because your outtake fan is so much stronger than those two fans and It wins pulling the air around those two fans right out of the room so those two fans are not moving cold air there keeping the hot air trapped down there because the hot air can’t rise because you keep forcing it down. Your basically cycling hot air down and it won’t let it get to the exhaust if that makes sense to you. Your hot air rises and the gets pulled over the top of ur fan by ur exhaust and on the way up your fans pointing down suck the hot air being forced up and blow it right back down just like a circle.Last edited by Inuart88; 05-06-2018, 11:26 AM.
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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 LolComment
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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.Comment
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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
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Try using the inline fan (exhaust) to suck air from the bottom and blow out the top. Pretty much opposite of what you currently have.Im just a shy guy with a big dick.Comment
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If it's within your means, you could switch to autocobs. They give off very little heat, almost nothing compared to hps and others. I have 4 in my 3*3*6, one over each plant.
Whatever you decide to do, I hope it works! Heat problems can be a bummer!Comment
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Ok Purv, just a thought here,the temp. at the top is is taken in a shaded area, radiant heat causes the higher reading. at your canopy. Put a thermometer in the sun on a 60 degree day and it aint gonna read 60.Comment
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PRIMO, that appears to be exactly what I got going on but my thought is that I still need temps at canopy, directly below light, to be ideally in the upper 70's. Mine is at 81 which is fine during veg but would like to get it a bit lower during flower. Gonna play around with fan locations to see if that will help.
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Just came across a really good hack to the Blizzard 8" Oscillating Fan....Make it a Wall Mount.........
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