Cool site! Never knew this exsisted. So I've had my Harmon 25th Anniversery stove for two years now and I love it. Lately its been acting funny though. When its running, it has this pulsating sound coming from it. I mean when there is a nice flame going, the flame will start pulsating. Doesnt do it all the time, but its annoying. The dealer asked if the air intake was blocked and no it isnt, then he asked the usual "is it clean" and yes its very clean. I am a machine technician by trade so I have a pretty good skill level. (at least I would like to believe so). Any thoughts on this? The intake door stays open the entire time its running, I figured it may be bouncing closed causing the dancing flame. Any thoughts? Oh by the way the window also gets black real quick also leading me to believe its not getting air. Thanks for any help!!