Veg Box and Flower Box Vented Together

I have a veg box set up running T5 lights and a flower box, has been used for veg with 600w mh, but will soon be going flower with 600w HPS. My question comes into play with air circulation and have air flow between both boxes. My flower box currently has a passive air intake, with exhaust fan pulling through a carbon filter, and then also separate ducting and exhaust fan for my air-cooled hood for my 600w. The veg box has a passive air intake, and a slightly smaller extraction fan.

My question comes in to play as I am wondering if I could vent my veg box in through an intake hole on the flower box? The reason I ask this is the carbon filter and extract fan in the flower room is big enough to handle both spaces, and would prefer to try and keep extra costs down at this point. Just looking for a little more experienced input! Thanks in advance!

I have 3 chamber box and I have pvc tube with elbows on each side of middle wall to let air thru but has to be enough holes and decent sized, in wall to make up for cfm of fan or it might possibly get too hot in there

That's some good information. Thanks!

No problem if you ever have trouble I can't get any help on this forum come over to IC mag it's way better in my opinion I've got a lot of help 4000 hits on my gRow

if you paint the inside of both elbows flat black before you install them they won't pass light

I have co2 generation in veg box, 4in pvc to flower, exhaust on flower, also have small fan inside pvc so it'll exhaust while bloom is off. A few pieces of mylar stacked with sits block light. You might be able to eliminate or reduce the time the veg exhaust runs, since mine is a small 12v fan I let it run while lights are on.