Glad to join your Forum: excellent discussions! My one month old VC Encore non-cat connects via 6" flue collar to 6 feet of single wall stove pipe then 25+ feet of Metalbestos (sp.?) chimney - all straight up, ending slightly above my roof's peak. Never a low-draft problem in 20 years of woodstoves. Encore's surface reaches 500-600 degrees, and it usually holds a very consistent temp. And yes, I hear the 'roar' or 'rumble' as I close the damper on a very hot fire. It gradually goes away.... ...BUT, when I re-load a very hot stove that contains 3-4 inches of red hot coals, fill the firebox as full as I can with dry hardwoods, allow that new wood to ignite for 6-8 minutes before closing the damper, keep the primary air set at its lowest, the temp of the burn STILL increases to the point where part of the stove glows red! And I can't turn the thing down any lower - I just wait 20-40 minutes for the red glow to subside. OVER FIRE! What part glows? I believe it's called the "Outer Back" - it's the part the flue collar bolts into. It's only thin sheet steel, but I assume the cast iron "Inner Back" is glowing, too....I just can't see it. An area about the height of the flue collar, and about one inch wide, on both sides of the flue collar, glows red. Called my Dealer, who contacted a VC/ CFM Field Rep. Dealer faxed me a letter from CFM's Sr. Tech Advisor, John Davidson. Mr. Davidson says that, yes, 'rear cast assemblies' on some Everburn stoves are glowing red. but, "The glowing does not constitute any safety or operational issues." (I'll post the full text of this letter if anyone is interested.) Yes, Mr. Davidson, but doesn't glowing red constitute a WARRANTY issue? OVERFIRING VOIDS THE WARRANTY! Not to mention...what happens when that part warps after the VC 3-yr cast iron warranty expires? Meanwhile, 2 questions, please: Is it pretty much accepted by the woodstove industry that glowing red cast iron results in shorter life expectancy of that cast iron? And, would the experienced folks here recommend I install a damper in my flue pipe so I can close it slightly and slow down this overfire condition? Thank you very much from Way Upstate New York - Lake Effect Snow Country!