Ventilation? help me!

[santacruz_organic]

If you saw on my "temp increasing" my grow room temp has been increasing. i have direct ventilation from out side right now ( pics below) but i want to use venting pipes to air cool my lights and so i can start using CO2. i put all my plants under one light (1000w mh) instead of two and turned the other one off. this decreased my temp by almost 10 F and now they are around 75F. I need to know if i should have one pipe going through both lights and sucking air from the ceiling or if i should seperate it. will one 6 inch vent be enough air to cool my room (with air cooled lights) and refresh the air? do i need an exaust fan as well as an intake fan or just an exhaust fan? please help me, any info you can give me would be great. thanks ----- my grow room is 7' x 9' x 8'

[BOYZNUS]

HELL, LEAVE IT AT 75 DEGREES

[doco]

I have seen multiple lights ducted together with one fan before. Not sure how powerful the fan was but it worked fine. Are you going to use a carbon scrubber?

I use a 265cfm intake fan but you might get by with the air you've got coming through the window with that fan.

[invision]

exhaust is more important than intake turn the fan around and see what happens to your temps

[santacruz_organic]

well the problem is i have two light fixures which i paid around $1000 total for and it would be a huge waste if i just left one off the whole time when i could be using it and speeding up my proccess. if both are on and my fan is on full blast it still gets to 86F and thats why i need a vent. system.

[santacruz_organic]

if im using 1 1000w light, how far should i keep it from my plants, their still young

[doco]

Im suggesting that a single high power vortex fan would be good ehaust for both lights but also continue to use the window fan for fresh air intake. Obviously the exhaust needs to vent out of the room.

[santacruz_organic]

The problem is that when i start to use co2 i need to have a controled ventilation process so im not wasting it, so i need to block in ways air can enter. thats why i need input on how much fresh air is needed to keep my room cool, i know it will be cooler once i air cool my lights, but im not sure if it will keep my temp low none the less. here is a picture i drew of what i was thinking about doing. tell me what you think, thanks------click on picture

[faithlessxxx]

.

Seriously, are you planning to go industrial?
I have my exhaust up by the lamp, CO2 Ã*s heavy and sinks, so I don't think it gets sucked up. Not for me, anyway.

.

[OregonsDank]

you can put them really close to the lights once they have rooted in soil, I keep 6 babies, 2 weeks old 20 inches from my 1000 watt MH in a 4x4 room, room temp is 73-75 while lights on measured ontop of my plants.

your picture looks fine , use a 465 cfm fan for fresh air in , and one for sucking the heat out of the room, thru your lights, and outside - works great for me.

I use a big ass attic exhaust fan , it was real cheap, you could rick up any size venting to it like 1050 CFM exhaust for 40$ :D Sucks the door off the hinge dang near :P Using somthing like this would be cheap, and would cool 2000 watts in that size of a room easy.. That room is way to big for just 1000 watts, I would use 2k , and maybe 1k mh 1k hps for budding

[santacruz_organic]

Yeah I have Two 1000w MH w/ Transferable mh/hps ballast so i was going to switch both to hps. are the exhaust fans your talking about the ones that hook up to the vent pipes or they other ones?

[OregonsDank]

not made to hook up to a vent pipe nope..

I had to use some plastic , used the panda stuff, and alot of duct tape lol , but I hooked it to and run 10 inch ducting , the fan is like 12 inches, runs decently quiet for the amount of power.. just look up attic exhaust fans for cheap but strong fans to exhaust your room.

[santacruz_organic]

how does this look?

[dusto2k3]

my setup is similar to that one except the fan on the right is not there. I use a 1K hps in a 4'x4' hydro hut. The temps in there stay the same as ambient. I have a 6' vortex cooling the lamp. Also, there is a 4" vortex with a carbon filter for exhaust.

The first pic is the fan pushing air from left to right into the lamp hood.

The second is the exhaust, thats where the filter hooks up. Eventually it goes to the attic. You can also see the vent on the other side of the light. That goes to the attic as well.

[Tom Green Thumb]

If you are going to use CO2 I don't think you want to do what you have drawn in the diagram. That way as soon as your CO2 is emmitted it will be carried out of the grow room. The second diagram is exactly what you need, but the question is, is the room going to stay cool enough? If not the only other suggestion I can think of is to rig up the smallest air conditioner you can find in a way that recirculates the air in the room and takes none from outside. Just a thought. Hope this helps and let us know how things progress. I have been interested in using CO2 also and I too would have the same problem you are having.

TGT

[xcrispi]

you'll get 40% more air flow using hard galvanized ductwrk too verses the foil sliky garbage also . your gonna go buy sweet hurricane fans n then go cork em up w/ cheap ass flexable ductwork is defeating your purpose .
just my 2 c worth

[CJBHM52]

if you do what your first drawing was turn it around so you pull air off the ground and exhaust it through the roof. the air on your roof will be warmer than the air on the ground. unless its concrete or asphalt then it probably doesnt matter.

[Racerx]

you'll get 40% more air flow using hard galvanized ductwrk too verses the foil sliky garbage also . your gonna go buy sweet hurricane fans n then go cork em up w/ cheap ass flexable ductwork is defeating your purpose .
just my 2 c worth

An expensive fan still pulls more then a cheap fan, crappy ducting or not. 90 degree elbows seem to make a difference...however to be honest...ive never found that much of a difference, especially with straight sections. I noticed no temp difference or airflow difference, but it looks sweeter and its a lot quieter.

I pull 2 hoods with 1 8" fan (750cfm) always and I feed the room with just passive air and some circulating fans or a smaller diameter and cfm intake fan. This keeps the room around 70 degrees all the time, but thats largely dependent on the intake charge temp.

If you can afford all the fans and noise, the most efficient way to cool your room will be to pull cold air from outside the room, through both lights, and out the grow room to a difference area then the intake. Then have a 1 large fan pulling air out of the grow room (if its sealed) or the large exhaust and a smaller intake fan pulling air in the grow room...and run that on intervals with recirculating fans always going on inside. This would enable you to take advantage of CO2 without loosing it and without getting the room to hot when you turn off the room vent. Make sense?

Or just get a portable A/C and be done with your problems.