The terms of this article shall not apply to:

(1) Flour, corn meal, or grits sold to bakers or other commercial secondary processors if, prior to or simultaneously with delivery, the purchaser furnishes to the seller a certificate of intent in such form as the Commissioner shall by regulation prescribe, certifying that such flour, corn meal, or grits shall be used only in the production of flour, bread, corn meal, or grits enriched within the given establishment to meet the requirements of this article or shall be used in the manufacture of products other than those covered by this article. It shall be unlawful for any such purchaser so furnishing any such certificate of intent to use the unenriched flour, corn meal, or grits so purchased in any manner other than as stated in the certificate;

(2) Flour or bread which is made from the entire wheat berry with no parts of the wheat removed from the mixture. In cases of flour or bread containing mixtures of the whole wheat berry and white flour or mixture of various portions of the wheat berry, such products shall have a vitamin and mineral potency at least equal to enriched flour or enriched bread as described herein;

(3) Corn meal or grits which is made from the entire corn with no parts of the corn removed from the mixture, but shall not be construed to prevent the enrichment of such products if so desired by the manufacturer. Any products so enriched must conform to standards and labeling provisions as provided in this article as modified by the Commissioner;

(4) Flour, corn meal, or grits for the wheat and corn producer whereby the miller is paid in wheat or corn or feed for the grinding service rendered, except in so far as such a mill may produce flour or degerminated corn meal or grits and sell or offer for sale such products, whereupon this article shall be applicable; nor shall this article apply to farmers in exchanging their corn for corn meal and wheat for flour, or having the same ground into flour, corn meal, or grits and disposing of the same for their own use or the use of the farm labor on their farms; or

(5) Mills doing custom grinding of wheat, whose capacity is 20 bushels of wheat per hour or less, and for custom mills that do not use artificial methods for bleaching flour.