Vented. To the outside... To get smoke out of garage.
In winter... Leave garage door open a foot for fresh air. Turn on ceiling fan to force lingering smoke / air out of garage. Hood tries to get as much smoke as possible out of garage direct. Duct I just rest on SI to guide smoke to vent. After 60 min... I close garage, turn off ceiling fan, put vent away, and let smoker run with just hood vent on.
This works well. In fact the first several steps aren't required... But I do them anywY to be safe. After the one hour mark... I go to sleep. 😉