Yes, otherwise it gets a bit too rowdy in there! ...at least with burgers/steak, the grease will lead to flare-ups, so I keep the doors closed and control the air. With chicken/salmon/pork, etc flare-ups aren't really a problem, but in that case, it pulls a lot of my warm house air up the flue, too. Always have to keep that efficiency in mind!And you grill them with the door closed?