I have a Lennox Country Canyon 310 Woodstove with non-catalytic reburn tubes. How high can I stack the wood in the stove? And for what reasons? Also, if I burn for a day or two without removing any ash, embers, or coals then obviously the next piece of wood is already closer to the burn tubes. Once I had the bar that holds the reburn tubes glowing red, is this ok? It was only glowing for about one hour. The stove top thermometer said about 550 farenheit.