Oklahoma Administrative Code
Title 310 - Oklahoma State Department of Health
Chapter 355 - Smoking in Public Places and Indoor Workplaces
Subchapter 11 - Smoking Room Negative Air Pressure and Smoke Containment
Section 310:355-11-2 - Negative air pressure requirements with changing occupancy and activity

(a) Exhaust from and ventilation to a smoking room can be reduced with reduced occupancy, as permitted by local mechanical codes, providing that sufficient negative air pressure is maintained to satisfy OAC 310:355-13-1.

(b) As activity in a smoking room increases, causing more frequent opening and closing of the doors, greater negative air pressure shall be utilized, if needed, to contain smoke within the smoking room and prevent its recirculation to nonsmoking areas.