In this article, we explain what an enclosure is and how to cite one, and we provide an example of an enclosure in a business letter. Window envelopes eliminate the cost of addressing envelopes and the risk of putting letters in the wrong envelopes.To format letters for use with window. Complete. Worksheet 1 on page 30 to determine line 19 of Form M1PR. Include the worksheet when filing your return. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. Animal Welfare Inspection Guide. Animal Welfare Inspection Guide. Four out of five workers in Hennepin County also live in the county. FCRA requires an employer to use a "consent" form dedicated solely to the purposes of FCRA.