Ohio Rev. Code Ann. § 4117.05
(A) An employee organization becomes the exclusive representative of all the public employees in an appropriate unit for the purposes of collective bargaining by either:
(2) Filing a request with a public employer with a copy to the state employment relations board for recognition as an exclusive representative. In the request for recognition, the employee organization shall describe the bargaining unit, shall allege that a majority of the employees in the bargaining unit wish to be represented by the employee organization, and shall support the request with substantial evidence based on, and in accordance with, rules prescribed by the board demonstrating that a majority of the employees in the bargaining unit wish to be represented by the employee organization. Immediately upon receipt of a request, the public employer shall either request an election under division (A)(2) of section 4117.07 of the Revised Code, or take the following action:
(b) Immediately notify the state employment relations board of the request for recognition. The state employment relations board shall certify the employee organization filing the request for recognition on the twenty-second day following the filing of the request for recognition, unless by the twenty-first day following the filing of the request for recognition it receives: