Iowa Code § 679B.4: Third appointee.

The members of the board so appointed shall within five days of their appointment recommend to the governor the name of one person who is ready and willing to act as a third member of the board, and upon failure or neglect upon their part to make such recommendation within the said period, or upon the failure or refusal of the person so recommended to act, the governor shall as soon thereafter as possible appoint some person to act as the third member of the board.