Mark P Posted July 14, 2011 Report Share Posted July 14, 2011 the white powdery stuff that collects inside the bottom of furnaces. Click to Enlarge 60.08 KB Quote Link to comment Share on other sites More sharing options...
Robert Jones Posted July 14, 2011 Report Share Posted July 14, 2011 Is that the pic you really intended to post? Without seeing the pic, I would go with exhaust condensate. Quote Link to comment Share on other sites More sharing options...
Richard Moore Posted July 14, 2011 Report Share Posted July 14, 2011 Dried flue gas condensate. To get condensate, just add water. [] Quote Link to comment Share on other sites More sharing options...
Marc Posted July 14, 2011 Report Share Posted July 14, 2011 Zinc Oxide? From the reaction of NOx compounds with the zinc in the galvanized flue? Marc Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted July 15, 2011 Report Share Posted July 15, 2011 White powdery residue/ substance. Exhaust particulate matter/ residue. Quote Link to comment Share on other sites More sharing options...
Mark P Posted July 15, 2011 Author Report Share Posted July 15, 2011 I uploaded the correct picture. Sorry for the confusion - only 2 more days till I go on vacation! Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted July 15, 2011 Report Share Posted July 15, 2011 the white powdery stuff that collects inside the bottom of furnaces. I call it white powdery stuff. Quote Link to comment Share on other sites More sharing options...
plummen Posted August 25, 2011 Report Share Posted August 25, 2011 Burned up heat exchanger,or the coating inside heat exchanger burning off Quote Link to comment Share on other sites More sharing options...
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