They should be able to isolate the HVAC system and only shut off the affected unit.
I am an environmental scientist and have done a lot of mold work. First thing to know is mod is ubiquitous in the environment. It is only an issue indoors if there is an amplification or different species when compared to outdoor. Some people are more sensitive than others and some can become "sensitized" where even low levels cause problems.
Cleanup is very similar to asbestos if the mod growth is large. Basically the area is isolated, negative pressure is established to keep all spores and other mold particles in the work area, all replaceable materials are removed and disposed of, non-replaceable materials are cleaned with a 5% bleach solution or a commercial fungicide and then painted with Kilz or another primer.
Once the cleanup is complete clearance sampling is typically done. Samples are are collected inside the work area and outside at the same time. The results are compared to see ii there is a difference in number or species.





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But they're working on it now, and I guess the guys have been working all day on seeing the extent of everything and then we'll finally have something to take to the ins co and get the ball rolling.

