After smoking ends, negative air pressure must be maintained at levels required to satisfy the requirements of OAC 310:355-13-1 until smoke components are cleared from the air.
Okla. Admin. Code § 310:355-11-3
After smoking ends, negative air pressure must be maintained at levels required to satisfy the requirements of OAC 310:355-13-1 until smoke components are cleared from the air.
Okla. Admin. Code § 310:355-11-3