I grow in a closed room in the basement. I just have to run the carbon filter enough so that nobody can smell what I am doing. I live on a hill and the back half of my basement is open and I have a big double door down there. I imagine in the summer time people will be in and out of my basement almost as often as the upstairs. But the first 3-4 weeks the plants don't really smell.I don't run the exhaust until flower when it is time to start reducing humidity.