For me personally, I grow in the secondary living room we have in the basement of our home. I run a sealed setup where there are 2 doorways. One that leads into the living room, and a second door that goes to the basement bedroom that's my veg room.
I bought the plastic dust barrier doors with zippers off of amazon.ca and I'm surprised how well they work. Cost was like $30 per. Even watching my co2 monitor its crazy how well these things seal the room.