Mike Lamb Posted October 31, 2015 Report Posted October 31, 2015 The best I could tell is this plastic fan is blowing air inside a sleeve over the primary vent within. I don't think it a draft inducing fan. Comments please. Click to Enlarge 80.11 KB Click to Enlarge 37.9 KB Click to Enlarge 47.56 KB
Bill Kibbel Posted October 31, 2015 Report Posted October 31, 2015 It's an attempt to reduce the required clearance to combustibles. The biggest issue is that it may extract too much heat and reduce the natural draft up the chimney.
mjr6550 Posted November 1, 2015 Report Posted November 1, 2015 Bill could be correct, or it could be an attempt to recover some heat from the flue.
Tom Raymond Posted November 1, 2015 Report Posted November 1, 2015 That was my first thought too. Just did I 1979 monster with two wood fired furnaces. Both had heat recovery tubes around the metal flues.
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