The term of office of members of the appeal board, other than the secretary, shall be for a period of four (4) years or until a successor is appointed and qualified, except that, of the initial appointees, the Governor shall designate two (2) members to serve terms of two (2) years, two (2) members to serve terms of three (3) years and two (2) members to serve terms of four (4) years. Any appointment to fill any vacancy shall be for the period of the unexpired term or until a successor is appointed and qualified.
24 P.S. § 17-1721-A