Okla. Admin. Code § 310:355-9-3 - Transfer air vents
Transfer air vents may be part of the enclosure to allow flow of air from the adjacent nonsmoking areas into the smoking room as a result of the negative air pressure in the smoking room. Such vents shall automatically close when airflow into the smoking room stops, to prevent recirculation of air from the smoking room to nonsmoking areas.
Notes
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