my set up thoughts?

Originally Posted by machead

Hi


Have a 3 meter by 2 meter grow tent, With 6 x 600 HPS lights with cooling hoods.


Am yet to buy the fans an this what id like a little help on.



My idea is 8” fan pulling out via carbon filter high up in the tent.


6” fan pulling air into the bottom on the tent.


another 6” fan pulling air in, Then spilt as my lights are in 2 rows of 3 an then back out of the tent into an other room.


Do you think that one 6” fan split will be enough to keep the lights cool or will i need 2 6” fans for lights?


Regards

Wow!!! Class A+ IMHO. I think your setup is gonna' rock with that amount of light! 57W/sq.ft! Your ladies will shine! Expensive bill. I am a bit concerned with the heat but there are people here more adept at air circulation, At 450 cu.ft./min, you'd replace the entire volume of air, at 900 CFM = 2X and so on. To get it real accurate you'll need to calc. the differences and also need the CFM ratings of the fans to know. Might want to invest in some fan control units or make yourself, pretty cheap.The idea for the 8" exhaust pulling from the 6" intake is good neg. pres., along with the separate 6" light zone is very good. The frequency the fans run will be set by (you) the temperatures you want to target. I am of the fresh air school and would only add that you know this too, add several circulation fans inside to keep the air mixed up. This will also help replace the gasses lost and get replenished by the new natural air composition. Good quality Thermostat/Humidistat (or auto controller) is imperative.
Best of luck to you and hope everything turns out real green and good...

Pictures would be good

The amount of lights your putting in sounds a bit like overkill in my opinion, if I was going with 6 lights in that area I'd do 400 watters but if you've got em it's fine

If you can I'd have them in cool hoods, otherwise the room is going to be quite hot, that way you could have 2 rows of lights with a 6" fan on each row cooling the lights, attach the out take lines (via the cool hoods) to a 'T' splitter and attach them to a mahoosive carbon filter with any sized fan for intake, though I wouldn't have any intake, I'd just do it passively, providing you can get some negative pressure in the tent (airtight).

On the other hand if you cant get or don't have cool hoods I'd have an 8" fan for exhaust and 1, 6" for intake (bringing air in from a window or somewhere cool) That should do it I think, those 8" fans are mega powerful

Edit: and as sfttailpaul said, Circulation fans, and temp controlled inline fans would be a good idea too!

yeah they are in cool hoods with 6" duct running in-between them, my concern is one 6" fan enough to keep the hoods cool? yeah i also have 6 oscillating fans in the tent moving the air around.

i also have the evolution temp/humidity controller controlling the in an out take

In which case have the lights as I described, 1 x 6" Fan per 3 lights

............ _______________
............6" fan | 0 0 0
............----------------------
'T' splitter
............ _______________
............6" fan | 0 0 0
............----------------------

Ignore the dots and the '0's are lights

Kinda like that if it makes sense, the 6" fans should be enough to keep 3 lights cool.

Leave the last light on the series open on 1 end

cheers never thought of bringing the fresh air in via the hoods good thinking

thanks

No problem!

It's the way I've always thought to use cool tubes

you want mroe air going out total through a filter in the setup as a whole

each 2 lights should probably have a fan, all3 of those going into an area with a couple huge carbon filters, near the top , running out of the area, being more than the total intake fro outside the area. if that makes sense