I dug a pretty big hole, say 20 x20 inches by four ft deep. And put my 6 inch flex intake in that. Built a wooden box structure over top, that I then camoflauged by making a wood holding shelf along outside of the shed.

Temperature control has been a challenge in my shed/grow. I used 2 inch thick, foam boards to increase insulation about 18 months ago. I wish that I'd put I'd doubled or tripled that.

Initially I had plants/ resevoirs right on concrete slab. Don't do that...lol..