Auto-fit: If you want your faxes to be auto-fitted, select Nearest Size. If you are sure you are only going to receive one fax format/size, you can select that format: A4 only, Letter only or Legal only. If you have chosen Nearest Size, you must set up a printer (this can be the same printer) for each format. If you have chosen one format only, you must set up a printer for that format.