I have seen multiple lights ducted together with one fan before. Not sure how powerful the fan was but it worked fine. Are you going to use a carbon scrubber?

I use a 265cfm intake fan but you might get by with the air you've got coming through the window with that fan.
doco Reviewed by doco on . Ventilation? help me! If you saw on my "temp increasing" my grow room temp has been increasing. i have direct ventilation from out side right now ( pics below) but i want to use venting pipes to air cool my lights and so i can start using CO2. i put all my plants under one light (1000w mh) instead of two and turned the other one off. this decreased my temp by almost 10 F and now they are around 75F. I need to know if i should have one pipe going through both lights and sucking air from the ceiling or if i should Rating: 5