All exterior accessible openings of any building used for business subject to the provisions of this chapter and which are not otherwise protected by photoelectric, ultrasonic or other intrusion detection devices, designed, installed and maintained by a qualified burglary prevention specialist shall be provided with security as provided in this chapter; provided, however, exit doors serving an occupant load of more than ten and serving hazardous rooms or areas shall be openable from the inside without the use of a key or any special knowledge or effort, and any additional locking device used to meet the requirements of this code shall be approved by the Building Official.
(`83 Code, § 15.08.050)