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Help identifying duct material?

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I did a "walk and talk" this afternoon for a client who was considering bidding on a house and wanted to know if there were any major big issues before putting in his offer. One issue I found is in-slab ductwork. I was able to get a few pictures but couldn't say what the ducting material appeared to be. I was hoping someone might be able to give me an idea of what the ducts are made of. Yes, I know a definitive identification would involve taking a sample and sending it to a lab or something. He's just concerned about the possibility of asbestos (house was built in 1956).

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In the third picture, I see a spiral seam. That's not typical of transite - at least not the transite in my area.

Good catch. But I don't know, there could be various types.

Here's an interior of transite. See the linear composition?

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Here's an exterior shot showing the dimpled nature of the surface.

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  • 7 months later...

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