(a) Each person certified as a manufacturer must, no less frequently than once every two years, complete continuing education courses totaling not less than three hours in such topics related to the manufacturing of manufactured homes as shall have been approved by the Department of State, the minimum number of class hours to be devoted to each such topic to be as designated by the Department of State. Each business entity certified as a manufacturer must employ at least one person who has satisfied the continuing education requirements set forth in this subdivision and who is certified by the Department of State as a manufacturer, retailer or installer.

(b) Each person certified as a retailer must, no less frequently than once every two years, complete continuing education courses totaling not less than three hours in such topics related to the retailing of manufactured homes as shall have been approved by the Department of State, the minimum number of class hours to be devoted to each such topic to be as designated by the Department of State. Each business entity certified as a retailer must employ at least one person who has satisfied the continuing education requirements set forth in this subdivision and who is certified by the Department of State as a retailer.

(c) Each person certified as an installer (other than a person holding an owner-occupant installer certificate) must, no less frequently than once every two years, complete continuing education courses totaling not less than three hours in such topics related to the installation of manufactured homes as shall have been approved by the Department of State, the minimum number of class hours to be devoted to each such topic to be as designated by the Department of State. Each business entity certified as an installer must employ at least one person who has satisfied the continuing education requirements set forth in this subdivision and who is certified by the Department of State as an installer.

(d) Each person certified as a mechanic must, no less frequently than once every two years, complete continuing education courses totaling not less than three hours in such topics related to the servicing of manufactured homes as shall have been approved by the Department of State, the minimum number of class hours to be devoted to each such topic to be as designated by the Department of State. Each business entity certified as a mechanic must employ at least one person who has satisfied the continuing education requirements set forth in this subdivision and who is certified by the Department of State as an installer or mechanic.

(e) Each person who obtains certification as a manufacturer, retailer, installer, or mechanic before completing the article 21-B introductory course must complete the article 21-B introductory course within 60 days after obtaining such certification. Each business entity that obtains certification as a manufacturer, retailer, installer, or mechanic at a time when it does not employ at least one person who has completed the article 21-B introductory course must cause at least one of its employees to complete the article 21-B introductory course within 60 days after such business entity obtains such certification. The requirements set forth in this subdivision are in addition to, and not in limitation of, the requirements set forth in subdivisions (a), (b), (c) and (d) of this section.