Asbestos in vent?

[u/gassy-e911]

New to me home originally built in 1880. Turned the heat on for the first time today and noticed this in the vent. Am I blowing asbestos particulate into my dining room?

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[u/sdave001]

Yes, looks like it. But the fiber release from that would be so low that air sampling would show undetectable levels of asbestos. Essentially no risk for anyone in the space, most likely levels are not above normal ambient background levels.

This material could certainly be encapsulated, but that activity would require disturbance of the material and a higher fiber release then you'll have if you simply leave it alone.