Howzit.
I'm going to do a passive intake and make it variable in the beginning so I can test the draw on the extraction fan. Not sure if that fan can be controlled much... I have a feeling it can only be controlled at higher RPMs to avoid damaging it, I've written to AMS to find out. I was also considering one of those 12v RAMs connected to a battery for loadshedding - haven't decided yet I just need to test the fan I have. It's overpowered for the room size so if I can't slow it down I could alwaysj ust put more bends in the ducting but then I'm using it full speed all the time and it seems like a bit of a waste of power. Will have to put some effort into that soon as the room is sorted. Hopefully the big fan works because with insulated ducts it's super quiet.
I hear you on the auto's, I've grown a bunch before and my best take was 60g. Won't say my worst! Surprisingly nice to smoke some of them. When I first grew a long time ago nobody outside of cultivation new what a Ruderalis was, for me it was like a swearword but these breeders are impressive man, you can get decent smoke out of an auto now.