Well I out to kick my self in the a** I always thought the doors were for something else other than cleaning, my manual does no say to clean them out says check.. weird anyway dummy me was wondering why the stove finally was petering out thinking bad combustion fan and all, but it ran fine no noise to grinding, then here I finally opened them access doors and wow! 6 years of ash..Poor Stove, man my wife and I feel bad, but we cleaned them out all 4 and i mean the stuff was high in them walls I did not know they were hollow..but the Stove runs like a Deere now! just like new and the air wash works after we learned that, they don't say anything about that either in the manual..but Thank god it works it was -31 out here in Cadott, WI today -12 windchill and we are toasty warm and we can enjoy the flames.