oikospastor Posted December 15, 2015 Report Share Posted December 15, 2015 I've been reading old post on the subject and have questions. I have found white powder on my indoor heating unit vent that leads to the ceiling. I just checked it and it rained a few days ago so I can't be sure if its a roof leak causing this or vent issues. What do you think? Click to Enlarge 53.91 KB Quote Link to comment Share on other sites More sharing options...
Robert Jones Posted December 15, 2015 Report Share Posted December 15, 2015 It's being caused by condensation due to poor ventilation. Basically an acidic reaction with the galvanized flue material. Quote Link to comment Share on other sites More sharing options...
dennispalmer Posted July 19, 2018 Report Share Posted July 19, 2018 The basic reason behind the white powder on indoor heating vent is high humidity level. Quote Link to comment Share on other sites More sharing options...
John Ghent Posted July 19, 2018 Report Share Posted July 19, 2018 22 minutes ago, dennispalmer said: The basic reason behind the white powder on indoor heating vent is high humidity level. Dennis, you are replying to a topic that was discussed in 2015. And many of your previous posts were also directed to old stuff. Quote Link to comment Share on other sites More sharing options...
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