I am probably sure you have looked inside your air duct vents/runs??? If not, My 3121 RL had alot of tiny construction residue (saw dust, styrofoam, plastic particles) blowing out over time. Cleaning up the residual debris was frustrating but I could imagine the tiny particles might be troublesome for respiratory issues?
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Chuck
2019 3121RL 35 ft., 2020 3500 Dodge Ram SRW, Cummins 6.7 HO, Air Bags - Air Lift BT Wireless Compressor, Coloma, Wisconsin
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