New tent...ventilation help!

T

thewhitelotus

Active Member
Just got my 4x4x7 Earth Worth tent setup and I had a couple questions in regards to ventilation. The tent has 3 6" duct vents, 2 4" duct vents, and 3 3x19" passive intake rectangles located at the bottom of the tent on 3 sides

Im currently running a 400w super sun 2 HPS that is NOT aircooled. Ambient temps in the room which the tent is located stays around 70-75 degrees beings i have central air. Here is a list of the equipment I have....

- Stanley blower modded to attach to can 33 filter
- Hydrofarm 100cfm Active Air Blower
- (2) 135cfm 5" square fan
- 2 osc. fans

what setup of said equipment would you suggest for keeping temps down in the tent? Id prefer to use passive intake and exhaust scrubbed air out into the room the tent is in for negative pressure but this is all new to me so im not sure

thanks!
 
S

silasraven

Well-Known Member
nothing beats, forced air into a cool tube, or close to the bulb, and out take fans. airflow is key to having good buds. passive is good, but the forced air in and out is better.
 
DemonTrich

DemonTrich

Well-Known Member
you didn't list the tent temps? and a cool tube is the way to go. if your having temp issues in veg, just wait till you flip into flowering. its a whole nother world in flowering. im doing 600w cool tube and I ran almost 7* hotter when I flipped to hps. now im down to 80/81* lights on and 72* lights off. basement grow, and 3 a/c vents opened. 6" 440 cfm cool tube fan (pulling), 420 cfm intake, 420 cfm exhaust, 18" fan blowing under the cool tube to get rid of the hot air pocket, and 3-5" clip type fans for circulation. see my grow journal link below for pics and what not.
 
MYOB

MYOB

Well-Known Member
silasraven said:
nothing beats, forced air into a cool tube, or close to the bulb, and out take fans. airflow is key to having good buds. passive is good, but the forced air in and out is better.
Click to expand...
I dont think so. I was under the impression that pulling air through a cool tube was the best way to go.

And passive intake twice the size of your exhaust is all you need. If you force more air that your pulling out, you will create positive pressure which will create leaks and allow unfiltered grow room air to escape. If the intake fans are pushing in less air than your exhaust, it will make the exhaust run inefficiently and strain the motors. You will be losing cfm. Plus, if the exhaust system fails, you will again create positive pressure and push air out of the room.

If you want more airflow, increase the exhaust cfm and increase the intake size.
 
You must log in or register to reply here.
Top