I am trying to determine if user experience with the Progress is correlated (or not) with particiular flue setup. I'm hoping only Progress owners will post their setup with the format I started. The important points: FLUE: Interior or Exterior/lined or unlined/size/height/insulated/Horizontal sections STOVE: Backpuffing/cat stalls/smoke out stack/smoke spillage on reload or NO ISSUES Fire_man Flue: 15 feet of uninsulated 6" SS single wall thru an exterior chimney. 10" Horizontal section. Stove: Some backpuffing, smoke spillage with open door when outside is about 50 degrees. Cat tends to stall when outside temps are above 50, burns much better when below 30 degrees out. I recently double wrapped it and am waiting to burn more. Rideau Flue 30 feet of double wall pipe Stove: No Issues Waulie Flue 25 feet of 7X7 Clay Liner thru center of house Stove No Issues Chipsoflyin Flue 25 feet of 12X12 interior with x2 45's and over 4" of Horizontal sections Stove Backpuffing, Cat stalls, sees smoke out of stack. HollowHill Flue 24 feet of single wall interior insulated, 1.5 ft double wall Horizontal to "T" Stove Backpuffing, cat stalls, smoke out stack, slight smoke spillage on reload Flamestead Flue: 32' single-wall, wrapped in insulation, interior chimney. 1.5 ft horizontal single wall to T. Stove: Backpuffed only during learning curve, now OK. Cat not lighting off at stovetop 325, smoke clears when cat lights off.