A carbon filter goes on the outside vent to stop the smell venting outside.

A carbon scrubber stays inside and just keeps recirculating the air inside the room to reduce odor.
LOC NAR on probation Reviewed by LOC NAR on probation 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