6 Stovepipe Heat Reclaimer / Radiators / Heat Exchangers 7 inch Dia stove pipe. Fits 7" diameter stovepipe. (approx 22 inch circumference) Made of 28 ga. steel, 1 1/2" wide Reclaim more usable heat from your stovepipe. This set of 6 covers a 9 inch length of pipe. Reclaims and radiates heat before it reaches the chimney They pay for themselves in a short period of time. Install in 5 minutes, snap on. They will last a lifetime. They never need maintenance.