This site is such a usefull tool, lots of great info.. hope someone can point me in the right direction. Cleaned out my chimney, replaced the air baffle gasket, cleaned and inspected entire interior of unit. This is my 3rd season with the unit and its been great so far. But for some reason it is no longer getting any secondary burn..Im pretty frustrated. Any Ideas. Could the baffle itself be clogged in some way?