This insert is for sale locally - I'm looking for a relative with a tight budget. All I saw was "King" on the right ceramic. It does have a Martin Industries blower. Flue exit is 5" x 14.5" rectangle (72.5" sq) - would that call for 10" round pipe (78.5" sq)? Does this look vintage 1975-1985? Being a "King" - would that mean US Stove Co? Probably pumps out heat but bet it eats wood like all get out. Thanks, Doug