AX 2840 High Speed Mono Laser Fax The FAX-2840 is a compact solution if you frequently send and receive a high volume of faxes in your office. This stylish, high speed machine has a 30-sheet automatic document feeder and a 250-sheet lower paper tray that means you wont have to refill as often.Please note this item is non-returnable, see our returns policy for more information.