Navien 30010604A Outside Vent Kit for all NPE units, OEM Part NPE-240.Units made before November 2014 did have a different vent kit (30010605A). Now, the item number 30010604A is good for all NPE models made after Nov. 2014. Will NOT work with NPE-2 units. If you're unsure, please verify on the manufacturer's website to ensure this is the correct part number.