Originally Posted by Marty S.
Try cozyparts.com. They sell Lennox parts to the general public and can look up the part number for you. Flue gas on the heater is way too hot for anything except metal.
Thank you very much for the reply. I have a question. My furnace downstairs is vented with pvc and one side has a rubber joint. Do they work differently then the Lennox LF24 I am trying to get hooked up? Here is a pic of my furnace. Cozy quoted 43.99 for the part (2" to 3" Flue adapter) which seems high but I don't know. Just want to be sure before I spend that kind of money if it can be done differently.