I can just quote for you what the act provides for, which is that the board shall be established and consist of “a Chairperson, at least two Vice-Chairpersons and any other members appointed by the Governor in Council”.
Currently the act prescribes a minimum of three persons on the board. I believe there are five now. I'd have to confirm that for the committee but I believe there are five members, not all of them full-time.