The 2000 article describes a similar situation at Lawrence Livermore National Laboratory and can be found at
Disassembling a perchlorate-contaminated ventilation system
https://pubs.acs.org/doi/10.1016/S1074-9098%2800%2900079-4

The article brings back memories of similar discussions we had working in that era. As I recall, the preferred approach to addressing this situation is steam the system until the rinse water comes back negative for perchlorates. The feeling was that the steam was likely to reach all of the places that the perchlorate salts were likely to collect. We were able to do that in one situation; the other we had to use a garden hose to rinse from the roof due to the construction of the hood ductwork. It was not a perchloric hood, so it was not a straight line to the roof and the ductwork did not contain the steam around the turns.

Good luck.

- Ralph

Ralph Stuart, CIH, CCHO
ralph**At_Symbol_Here**rstuartcih.org

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