Thanks Mustard, naw thats not from the outside of the room its in the room it opens up to the rest of the attic, its almost like a 2 story attic, we inherieted this place, its been remodeled a whole lot. urban farmer posted on my other post that i could put the carbon filter in my grow space and it will scrub the air with out having to duct. i have a really good ventilation system, the air flows into the room and up over that wall you see in pic three and out a window (really, really high up grom the ground.) Let me know if im just not getting a point of why people duct, but im trying to do it without im just trying to minimize the smell as much as possible before it moves up and out that window.