My grow is under my house and I sometimes get seepage from the veg or flower rooms. I had an apraiser come by with my landlord. I put the gel in small trays at the entrance to the room, in the room near the exhaust fan, and I also painted it on cardboard strips and put it around the open vents in the area opposite my wall that separates the grow from the vented crawl space. I use an ozinator in the crawl that is fed from the grow by a large can fan. The stuff worked wonders, kept away all suspicion, and did not screw up the taste or smell of my grow, although I wouldn't just open and leave it out full time in large quantities. Put it in perimeter areas or by a fan that will mix the smells and carry them out.