Any rule lawfully promulgated prior to the effective date of this chapter shall remain in full force and effect until:
(1) Such rule is expressly made ineffective by the provisions of this chapter; or
(2) Such rule should expire by reason of failure to refile the same as provided in section five of article two, or expires pursuant to its own terms and provisions lawfully made before the effective date of this section; or
(3) Such rule is repealed by the lawful act of the board, in conformity with this chapter; or
(4) Such rule is invalidated by an act of the Legislature or the force and effect of another law.