D.C. Mun. Regs. tit. 25, r. 25-E308
Each barber, cosmetology, or personal grooming facility shall provide toilet facilities (restrooms) for personnel and customers, in accordance with the most recent versions of the District of Columbia Construction Codes, as specified in § 102.1(g)(3).
All restrooms, locker rooms, and toilet rooms shall be adequately ventilated so that excessive moisture is removed from the room. Acceptable ventilation includes mechanical exhaust ventilation, a recirculating vent, or screened windows in accordance with the most recent versions of the District of Columbia Construction Codes, as specified in § 102.1(g)(2).
Each heating, cooling, and ventilation system shall be properly maintained and operational at all times when the rooms are occupied.
All restrooms, locker rooms, and toilet rooms shall be capable of being maintained at a temperature between sixty-eight degrees Fahrenheit ((68° F) (twenty degrees Celsius (20° C)) and seventy-eight degrees Fahrenheit ((78° F) (twenty-five point five degrees Celsius (25.5° C)) while being used by customers, as specified in Occupational Safety & Health Administration's Recommendations for Employers in Section 3, Chapter 2, V.A.3. (OSHA technical manual).
D.C. Mun. Regs. tit. 25, r. 25-E308