The Baum folder is a durable and versatile floor model folding machine, capable of folding paper measuring from 3" x 5" to 20" x 30", at speeds up to 50,000 sheets per hour. This machine boasts six folding options--single, letter, fan, French, double-parallel and double-letter--and can accept all weights of stock up to 140# cover. It is also very good for two directional folding such as 11 x 17 folded down to fit in a #10 envelope.