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. A template is a pre-formatted file that serves as a sample or guide for a new document.It is used to help ensure accuracy and consistency in a letter's format. 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. You can arrange a letter in a full-block, semiblock, or simplified format. As Benjamin Franklin liked to say, "Time is money. Add an enclosure notation after your signature at the end of the letter, and abbreviate it with "Enc." or "Encl. This is an example of how to type a business letter in block format with mix punctuation and your final document will look just like this one. 31, 1783, detailing all the reasons why BF should complete and publish the account of his life.