I'm new to the forum and coal burning, but have been experimenting for a couple weeks now. I burned approx 15LBs of anthracite in my U.S. Army Cannon Heater for 12+ hours throughout the worst of the storm. No barometric damper in place yet (arriving soon), MPD wide open, bottom stove damper at 10%. I was nervous to burn during the storm, but had sand at the ready and multiple CO detectors upstairs and down. I expected a fight to control things with the high winds. I had some down drafting going on from the wind when I was getting it lit , but once things heated up the draw was much better. In fact, no noticeable change in the burn from the strong winds at all to my surprise. My flue does a 90 deg lateral job for 2 feet before connecting to the main chimney flue. Maybe the zig-zag helps lessen the affects of strong winds? Is it possible that the large chamber (potbelly) and secondary chamber above absorbs changes in air pressure? I'll post a pic of my stove when I get a chance, it's a beauty!