New to pellet stoves and this forum so forgive me if I post this wrong. I have a USSTOVE 5510 King. I did a self install with a 3" vent pipe through the wall with a 4' rise. I live in an older farmhouse and I did not install a fresh air intake due to it being "optional" if the house is not well insuilated. I am burning hardwood pellets and stove has worked great except after about 12 hours of running the burn pot fills and overflows with lumps of "charcoal" type clinkers in the burn pot. I have the draft fan on high and a medium heat setting. I am wondering if adding the fresh air intake will most likely "solve" my problem. Thanks in advance.