When an agency proposes a legislative rule, other than an emergency rule, it shall be deemed to be applying to the Legislature for permission, to be granted by law, to promulgate such rule as approved by the agency for submission to the Legislature or as amended and authorized by the Legislature by law.

An agency proposing a legislative rule, other than an emergency rule, after filing the notice of proposed rulemaking required by the provisions of section five of this article, shall then proceed as in the case of a procedural and interpretive rule to the point of, but not including, final adoption. In lieu of final adoption, the agency shall finally approve the proposed rule, including any amendments, for submission to the Legislature and file such notice of approval in the state register and with the legislative rule-making review committee, within ninety days after the public hearing was held or within ninety days after the end of the public comment period required under section five of this article: Provided, That upon receipt of a written request from an agency, setting forth valid reasons why the agency is unable to file the agency approved rule within the ninety-day time period, the legislative rule-making review committee may grant the agency an extension of time to file the agency approved rule.

Such final agency approval of the rule under this section is deemed to be approval for submission to the Legislature only and does not give any force and effect to the proposed rule. The rule shall have full force and effect only when authority for promulgation of the rule is granted by an act of the Legislature and the rule is promulgated pursuant to the provisions of section thirteen of this article.