Hello, I need help determining the age of a Patriot 80 Plus Furnace.The serial number is: OLFO120-D3.5 061500 D 000101I’ve tried googling it and looking for lists but I can’t seem to find any that match this format. I may also be reading it incorrectly. I’m in a pinch trying to buy a house so any help would be greatly appreciated. Thank you! via /r/DIY https://ift.tt/3iVe8rM
