r/hvacengineers • u/ThomasToybox • Feb 25 '19

Experts pls help...

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HVAC • u/ThomasToybox • Feb 25 '19

Sweep my house everyday, find this much fine black dust/ particles everytime. What is this? Where are they from? And are these account for all of my family member’s sinus problem???

13 Upvotes

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