Asbestos heating ducts were mostly made with transite cement. This kind of cement was strengthened with asbestos fibers and was mostly used for pipes and ducts. Chrysotile or “white asbestos” was the type of asbestos preferred for the protection of ducts.
Although asbestos was added for durability, the passing of time made it friable increasing the material’s fragility and the potential risk of exposure for the workers interacting with it. You could have been exposed if:
- You worked directly with asbestos insulated heating ducts
- You performed maintenance work in factories or plants
- You worked on ships
- You performed demolition work