700 cfm and up,its better to have to much exhaust than not enough.espescially with a passive system,that way u dont get stuck with a fan that doesnt work and the fan u could have bought in the first place for a little extra.
disrupt86 Reviewed by disrupt86 on . Grow Room in progress Hey all :thumbsup: I'm in the process of creating a new grow room in my basement and would like to get the thoughts of my fellow growers on a few things so I can hopefully get it right the first time LOL!! :D 1st question will be lighting. the room itself will be 12' by 7' and 6 1/2' ceiling. Hydro unit will start as a 9 site ebb and grow system ( 9 seperate buckets with 1 central res) and I will be expanding up to 18 sites tops. Originally I had thought of using 2 1000w lights but have Rating: 5