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Under slab ducts


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I did a split level home the other day with a partial slab on grade. The ducts for this section are run under the slab.

After removing the register covers in this area, I found what I believe to be the round asbestos ducts (the official name slips my mind).

It is clear there are friable areas (sections were cut to install the registers).

My question is simple;

What is the standard repair for under slab asbestos ducts? Can they be re-lined? Is removal the only option?


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