Ohio Rev. Code § 1733.17: Quorum of board.

Except for regulations applicable during an emergency, as that term is defined in section 1733.01 of the Revised Code, and except that the articles or regulations may require a greater number, a majority of the entire authorized number of directors is necessary to constitute a quorum for a meeting of directors except that a majority of the directors in office constitute a quorum for filling a vacancy on the board. The act of a majority of the directors present at a meeting at which a quorum is present is the act of the board, unless the act of a greater number is required by the law, the articles, regulations, or bylaws.