What is UL Air Duct Material Class 1 (Form A) Issue 4690?


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Does anyone know what this round air duct material is composed of? It has been installed in parts of my furnace and AC system of my 1974 built home.
Years ago, some of it crushed in the attic and was replaced with sheet metal ducting. It appeared to be made of a cardboard composition. Might it contain asbestos??
Attached is a photo.

Thanks!

fga1939
Air Duct Material Label.JPG
 

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