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White Powder on Vent

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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?

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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.

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