Asbestos or not?

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Dec 3, 2016
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I cut into my floor doing some plumbing repairs. I noticed a fibros board under the underlayment.

The fibros board covers over my return ducts to encapsulate the returns thru floor joists. I appears to be under the entire floor underlayment also which is a crawl space.

Obviously i have already been contaminated if it is asbestos... What do i do if it is asbestos? IS it asbestos? Can you tell by pictures?

Im particularly worried since it is in my hvac ventilation system already
 

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