I recently bought a used enviro maxx. It was made in 2007. I have done a lot of reading and am not sure what i should do to get a better burn from my pellets. I have the natures heat brand from Walmart. Gives plenty of heat but they don't seem to burn down all the way and it needs to be constantly cleaned. I am not sure if the blower is operating as it should or if it is the pellets. Opening the damper seems to have no effect on the flame. After a while the pellets begin to overflow the burn pot. Also the air intake port looks like it was never used. it is just a flange on the back wall of stove with no hole in it. Is that normal? Any help would be great?