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Hi I just answered your other question about heat. From your drawing it looks like you are running 2 tents but exhausting both tents into one run of ducting. Tried this in the past and one tent always gets to warm. I didn't do to many experiments to resolve this but I did find that having 2 extractors at different speeds didn't help as one priorities the other through the ducting. I was going to double the diameter of my ducting to see if that helped but in the end I used seperate ducting for each tent and had them venting air separately. I'd suggest either ducting both tents exhaust separately or trying a lot bigger ducting if your still wanting the exhausts to combine.