Canon Printer Expansion Cassette AF1 - Paper Capacity: 640 sheets Compatible models: LBP664C / LBP662C / LBP661C / LBP654C / LBP652C / LBP651C / MF745Cdw / MF743Cdw / MF741Cdw / MF735Cdw / MF733Cdw / MF731Cdw My model is MF735Cdw, and I will also include the environmental heater. (For reducing paper moisture absorption: photos 4, 5) I believe the environmental heater is EH-C1, but there is no model number listed on the unit, so I'm not certain. However, it doesn't attach to the printer; you just place it on top (photo 6), so there shouldn't be any problem. Thank you for looking.