Help with placement of circulation fans!

Kjc99

Kjc99

Member
Hey guys... Hope everyone had a good 420! Need some help or advice.... This is my 2nd grow and 1st with an hps bulb.... I have ambient room temperatures in the mid 60's and my canopy is always 78-80° when summer hits here in Alaska I think I'll be in trouble.... I am sucking air from my tent through the reflector and out of the room... As you can see from my pictures I have only 2 stationary fans in the 4x4 tent both blowing under the light.... What am I doing wrong? Should I move the fans... Also I've tried using a tower fan but temperature just climbs....
1. The white thing is my temp gauge. Should I move it or is this a good location hanging from the reflector
2. Light distance is about 16 inches from the tops....
Fox farm soil
3 gallon pots
600w hps.. Air cooled reflector. No filter
6in 435 cfm inline fan 20150420_202253.jpg20150420_203853.jpg 20150420_202243.jpg 20150420_202232.jpg 20150420_202253.jpg 20150420_203853.jpg 20150420_202243.jpg 20150420_202232.jpg 20150420_202232.jpg
20150420_202253.jpg 20150420_203853.jpg 20150420_202243.jpg 20150420_202232.jpg 20150420_202253.jpg 20150420_203853.jpg 20150420_202243.jpg 20150420_202232.jpg
Temps in the tent itself are good @72-74°
Any advice is greatly appreciated!
 
I think the issue is that heat rises so your exhaust is pulling from the lower part of the tent when most of the hot air is going to the top of the tent. I have a 8x4x6 tent with two 1000w lights and I have my intake pulling from outside and ducted it so it goes through both lights to keep them cool and then I have my exhaust pulling the air out from the very top of the tent with 2 smaller fans on each end blowing through the plants. I live in San Diego where it is usually always warm and even running two 1000w lights it tends to keep it at a reasonable temp.

Long story short I think having some sort of exhaust pulling the air out of the top of your tent will help keep the temp down.
 
Salty3 said:
I think the issue is that heat rises so your exhaust is pulling from the lower part of the tent when most of the hot air is going to the top of the tent. I have a 8x4x6 tent with two 1000w lights and I have my intake pulling from outside and ducted it so it goes through both lights to keep them cool and then I have my exhaust pulling the air out from the very top of the tent with 2 smaller fans on each end blowing through the plants. I live in San Diego where it is usually always warm and even running two 1000w lights it tends to keep it at a reasonable temp.

Long story short I think having some sort of exhaust pulling the air out of the top of your tent will help keep the temp down.
Click to expand...
Thanks for the advise so I'm trying to avoid a second inline fan but that's probably the answer.... Maybe if I put a Y connector so I'm pulling hot air from the top of the tent.. & add ducting to the other side of the hood to pull air from the actual room and not the tent itself it might help? But that would cut my cfm's in half right? Kinda on a budget but from looking around no one really exhaust the air from the tent and uses that to cool the light also.... Just on a tight budget, but with summer coming.. Might have to try your setup and put the hood on a fan by itself... ..
P.s....i used to live in Anaheim, CA and I couldn't imagine using a 1000w during the summer... Sounds like you got yours dialed in pretty good!
 
Kjc99 said:
Hey sorry guys I'm using my phone.. I meant to put 4 pictures and now there are many duplicates
Click to expand...
You have the glass in the hood rite?, if so I would add a piece of ducting to the open flange of that hood, and have it pull from the very top of the tent, then through hood and finally out. Make sense?
 
Aeroknow said:
You have the glass in the hood rite?, if so I would add a piece of ducting to the open flange of that hood, and have it pull from the very top of the tent, then through hood and finally out. Make sense?
Click to expand...
... Ya so no Y connector just try and suck the warmer air from the top through the hood and out right?
 
Kjc99 said:
... Ya so no Y connector just try and suck the warmer air from the top through the hood and out right?
Click to expand...
Yes. And if you were to hang a charcoal filter up high in the tent(where you want it), you would run that inlet ducting to it. So it is evacuating the hot air first. It's what you want to do.
 
Aeroknow said:
Yes. And if you were to hang a charcoal filter up high in the tent(where you want it), you would run that inlet ducting to it. So it is evacuating the hot air first. It's what you want
to do.
Click to expand...
Ok I'm gonna give that a try today when my lights go on @10am I've seen setups like that around the Web.... I don't have a filter yet because I've been exhausting out of my room up into the attic but it's definitely smelly air... It seems like I will be sucking even hotter air through the bulb, but it kinda makes sense because the hottest air is at the top and it won't get a chance to get hotter.... Sorry I'm a noob,!
 
Kjc99 said:
Ok I'm gonna give that a try today when my lights go on @10am I've seen setups like that around the Web.... I don't have a filter yet because I've been exhausting out of my room up into the attic but it's definitely smelly air... It seems like I will be sucking even hotter air through the bulb, but it kinda makes sense because the hottest air is at the top and it won't get a chance to get hotter.... Sorry I'm a noob,!
Click to expand...
Yeah, with just one fan, it's the only way IMO
 
I agree with Aeroknow. I have a charcoal filter hanging in the very top and middle of my tent pulling the air out and blowing it straight outside. It gets rid of the hot air and filters it as well so you cant smell shit. Even when I was drying in my tent. For the time being he had a good idea, pull the air from the top of the tent, through the light, then out. That should help until you can afford another fan. Look on craigslist too. I found my fans on there and only paid about $60 per fan and they were pretty much brand new. You might get lucky and find a nice cheap one.
 
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