Fan Motor provides cooling for the unit. 80mm x 80mm x 25mm 12volt DC Quiet design keeps noise to a minimum. May require the purchase of a 2299001542 12volt DC Fan Speed Controller. Note plug end to determine correct fit. *Please note: If replacing the 2299001565, you may have to swap plug ends from your old fan to make the new fan work. See 169116-001 for connectors.