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Hi all,
Thought I'd post an update to my question about cleaning A/C ductwork in our 2019 Montana model 3121 RL. We had our rig in for some warrantee work and general maintenance. I described the problem and showed them the black specks & chunks that were showing up on all surfaces. The techs said they could blow out the ductwork (they advised against using anything other than blown air because of the risk of tearing the ductwork). Since they were replacing the bedroom A/C unit under warrantee anyway, they kindly didn't even charge us for the cleaning. Since we have the unit back home the air is clean again. Just thought I'd let the hive mind know that ductwork can be cleaned by blowing it out! As I think about it, I wonder if the malfunctioning A/C unit might have been contributing to the problem. At any rate, things appear to be working properly again.
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