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. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl.1. In the sample letter, fill in your personal information. 13. Enclosures. An enclosure can prevent a letter from becoming too detailed. Using the Local Let Construction Agreement to the Locals for Execution template letter, the. Perhaps because enclosure letters are so mundane, they have often been a target for the use of stilted and somewhat absurd lan- guage. Following are three sample letters of application. •Any numbers or letters are crossed out or whited out. Spell out street names that are numbers 1 through 10. For example: 915 West Seventh Street.