New to Pellet Stoves. Just picked up an Enviro M55 and have it up and running. The heat output seems ok but I have a lot of dust in the fire box. This is from the pellets. Could the Pellet damper opening be set to small and the pellets being ground up before getting to the fire box? I have less the 4 hours running this stove and have not set anything but the heat level. Thanks for the help.