Hello all. This is my first time posting although I am have been lurking for quite some time. There's definitely some great info on this forum and some very experienced growers so I'm really hoping for some help.

I have have moved into my new apartment and am at the start of a new grow. I am using the two closets in my bedroom -- one for veg and one for flowering. They are side by side, seperated by a drywall wall. The closets are about 2' wide by 5' long by 8' high.

Right now I am using a 400w MH for the veg closet with 25 two week old plants under it. I have 2 plants under CFLs about two weeks away from harvest in the flowering closet. I have a 400w HPS which would love to use for flowering but don't want to hook up until I have the ventilation set up correctly.

I own an Active Air 6" 400 cfm inline fan, several small desk fans, one of those plastic Stanley blower fans (which moves a surprising amount of air!) and a crappy 6" duct booster fan from Home Depot.

I am wondering how I can use some (or all) of these fans to most efficiently ventilate my closets, so that I can hook up the 400w MH lamp in the one closet and the 400w HPS in the other and keep my temps nice and cool in both rooms?

Right now I have the inline fan inside the flowering closet connected with a t-shaped duct which is simultaneously pulling air out of the veg closet and the flowering closet and out through a hole in the wall to the outside. There are desk fans in both closets blowing on the plants to help promote air circulation.

Sorry if this post his been a been a bit long to read through, but I really do want to get this right. Thank you all for your help in advance.

If it is an option I would get another 6" fan and do one for each closet. Gotta keep air moving out especially if you are not going to vent the reflectors...I have a 4x4x9' closet and I use a 6" vortex to exhaust (through a filter) and a 4" vortex to cool my reflector. If it's hot and stuffy in there to you, the plants will feel the same way. You'll of course want to use the fans you have to either circulate inside the closets or back up your intake or both.
What are your temps at now?
Cheers

If the intake temps are lower than 70, I would think you can get away with one fan extracting from both closets, but you might struggle to keep in the optimum temperature range of 76-78. Obviously it's best to have one fan per growroom, so each room's temperature can be managed independently, but if that's not an option right now, wait til you harvest what is in the flower chamber, then turn the hps on with no plants, leave it running for a good few hours during the hottest part of the day and check the temps.

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Originally Posted by ceestyle
Don't be a martyr wasting $100 or more on CFLs to prove they're inferior for flowering pot.

Thank you for the quick reply

My temps currently hover around 88 degrees, and this is slowing down growth on some plants. The temps outside the closet are in the low to mid 70s (as controlled by AC.)

I would love to get another 6" fan but I unfortunately don't have the cash for it right now as I've spent quite a bit of money moving into my new space a month ago. I need to do with what I have for now.

My husband thinks the set up should be two seperate exhausts, one running out of the veg closet through the flowering closet to the window and out using the 6" inline to move the air out -- and a different seperate exhaust in the flowering closet going from the Stanley blower and out the window. This would require making another hole in the wall and I'd like to get a few opinions before we start breaking walls to make something which potentially doesn't work.