Manufactured home means a structure, transportable in one or more sections, which in the traveling mode is eight body feet or more in width or forty body feet or more in length or when erected on site is three hundred twenty or more square feet and which is built on a permanent chassis and designed to be used as a dwelling with or without a permanent foundation when connected to the required utilities and includes the plumbing, heating, air conditioning, and electrical systems contained in the structure, except that manufactured home includes any structure that meets all of the requirements of this section other than the size requirements and with respect to which the manufacturer voluntarily files a certification required by the United States Secretary of Housing and Urban Development and complies with the standards established under the National Manufactured Housing Construction and Safety Standards Act of 1974, 42 U.S.C. 5401 et seq., as such act existed on January 1, 2010.