In San Francisco, the lounges “must be directly exhausted to the outdoors by a filtration system that, at minimum, eliminates all odor and smoke,” according to the city’s operating standards. Also, among other rules, smoke must not drift into other portions of the premises, and the smoking rooms doors must be self-closing and have a gasket to provide a seal where the door meets the stop.

Source: Los Angeles Times March 17, 2019 21:11 UTC