By Julian from FL on May 22, 2013
I know the closed diameter will fit a 12" chimney pipe, but what is the width of the metal?
By Collin C. - NFI Master Hearth Professional on May 22, 2013
Answer:This collar will have a width of approximately 3 inches around the perimeter of the chimney. Please keep in mind that this collar is designed to fit FMI 12 inch I.D. chimney, which has a 15 1/2 inch O.D.