Any insurer, individually or as a member of a pool, group, or association, engaged in the business of insuring special types or classes of risks in connection with a particular inspection or engineering service or with respect to which a set of standards has been maintained to the satisfaction of the commissioner may submit its loss experience data, forms, and proposed rates and negotiate with the commissioner for his approval of such rates and forms either directly in its own behalf or through a unified facility of the group created, licensed as a rating organization and maintained entirely or in part for such purpose. In evaluating the forms and rates of such an insurer, or pool or association of insurers, the commissioner shall act with due regard for the previous record of such insurer or group of insurers and with due appreciation of previous and prospective loss trends, both within and outside the state, and to any other factors reasonably related to the classes or types of insurance written by such insurer or group of insurers. If approved, such forms and rates shall be filed with the rating organization, licensed to make rates on such types or classes of risks, of which such insurer is a member or subscriber. Nothing contained in this section shall be construed as exempting any insurer, pool, group, or association of insurers from all other provisions of this article.