This is the replacement rectangular fiberglass gasket for all St Croix pellet stoves manufactured in 2003 and earlier and also fits the newer Ashby-MF, Ashby-P and York Insert, that still use the ‘snail-style’ convection fan. This gasket goes between the blower and the stove frame, it ensures a quiet operation of the distribution blower by minimizing the vibrations therefore avoids the wear on the blower motor.