INTAKE, OUTTAKE & DUCTING QUERY

...I am not sure. I can't understand how you would control either environment that way.

Original post said these were Flower tents so environmental control is going to be crucial. Light leaks from the adapted work arounds you are proposing could be detrimental- be careful and take your time on that-

Veg tent or an Auto grow....dunno, less forgiving.

But that these are Flower tents...that's what you have to solve the problem for-

When you fold/flap/tape the vents together, maybe take a towel or old black t-shirt and lay over whatever you constructed ot help-

@Dr. Ozzy Actually I have only done this as a temporary measure for about a month and it seemed to work ok. I plan to start growing Autos along side my Photo Periods in the Veg tent (18/6) and will hook the two tents together again for a full grow in both tents so I'll let you know how that turns out. Assuming I get that new light for Christmas ;o)

I would prefer two separate ventilation systems but a few feet of ducting is a lot cheaper than a new fan and carbon filter. Growing on a budget so I will try this first.

@Cap Stone make it work growmie!

@Cap Stone when I had two rooms growing I thought shared intake and exhaust. I was worried about room A creating higher temps in room B when lights were on and how actual fresh air make it to room B. So I went to the heating section of Lowes and bought two 6 inch Y ducts and spliced the inlet prior to rooms, and did the same for exhaust using that fan to pull from each. I don't think you'd need 6 inch fans and ducts for tents but the idea worked well in my rooms.