box venting set up

[smokadepep]

built a grow cab, now i just purchased a jardin dr120 tent, , , and the dimensions of both boxes are about 4x4x6.5, and the lights are all aircooled, seperate from grow room, this is a picture of what i am talking about, wondering if i can vent both boxes like i have it drawn up

 

[smokadepep]

just to refresh the post, anyone with an opinion or reasoning??

 

[FirstTracks]

you're trying to work against convection there with your intake for the first space at the top of the space.

why don't you have an independent intake on each space, and an exhaust on each space. you can use a section of Y duct to bring two 6" ducts to an 8" or 10" duct to your filter.

this will allow you to run the lights at different times if you want. Having the spaces connected the way your picture shows would force you to run on the same light schedule all the time in both spaces because light would leak through the connecting ducting.

 

[smokadepep]

could i exhaust the whole grow box from the light, with a 306cfm fan? one for each box, and blow them into one carbon filter by using the y joint? i would just leave the intake on the light open in the grow room instead of vented from the outside, also would this make my light unstable because of the velocity of air?

 

[smokadepep]

anyone exhausting the grow room through your light?

 

[JustEnoughForMe]

yeah smokadep i do,

but be careful as pulling hot air will shorten the life of your fan. worth it in my microgrow

 

[PharmaCan]

anyone exhausting the grow room through your light?

Me too. Like in the photos below.







You can see more pics of the way I set up my cabs here:

http://www.icmag.com/ic/showthread.php?t=96644

yeah smokadep i do,

but be careful as pulling hot air will shorten the life of your fan. worth it in my microgrow

I was always one of those guys that believed push/pull didn't make much difference. I learned my lesson the hard way. I was pushing through the light and out in one cab. Even though I was using a good quality flex duct, if there really is such a thing, the 6" flex duct broke so I was blowing hot air into my cab for several hours - temp reached 116*f, 5-6 weeks into flower. F**K - can you say air buds? If the fan had been sucking instead of pushing, at least I would have been exhausting most of the hot air instead of turning my cab into a frigging sauna.

As a cab gets emptied, I'm going to re-do the ventilation so that the fans are sucking and I'm replacing the single wall flex duct with the double wall, insulated flex duct (like real a/c folks use). It's aggravating and costly when equipment fails. It's best to try to anticipate any failures and set things up to mitigate as many adverse consequences as possible, should one occur.

PC

 

[smokadepep]

is it better to push, or pull the air through the carbon filter?

 

[phr3d0m2gr0]

Always pull if you can. I also have air exhaust through a carbon filter then light then the fan and out the back of the box. Check out the link in my signature. You could vent both grow boxs the way you have illustrated above, but you would need to run the same light schedule or make the venting light proof (which isn't very hard). What i would suggest doing is running large vents on the box which the fan isn't connected to and then a very small intake on the box which has the fan connected to it.

It might be a bit difficult to understand so let me know if you want me to draw something up.

-Phr3