I think that you can have the intake hole without a fan, and put an exhaust fan over the exhaust hole- this way when you suck the air out it creates a vacuum in the grow space- which will then suck in fresh air from the intake hole- I "THINK".
Zeus2007 Reviewed by Zeus2007 on . ventilation concerns my concern is my intake and exhaust set up.do i have to have the intake alittle bigger then the exhaust.can i have two passive intake to one exhaust.how does that work and whats the best way.right now i have two 4'' hole one for exhaust one for intake but my question is can i have two 4'' inch intake to one 4''exhaust with a intake fan Rating: 5