This debate has been going on amongst a number of us, as a friend asked the question. 99% of of agreed – NO, it can not be reclassified when the COM DUST is inside the space. Cleaning it would be a Permit-Entry; once clean AND FREE of the COM Dusts, then we could discuss reclassifying the space. So tonight, continuing my testing of AI, I asked Gemini Plus the question, and it agreed with some sound reasons why (again, 99% of us already agreed).
Reclassifying a permit-required confined space (PRCS) to a non-permit confined space under OSHA 1910.146(c)(7) is a common goal, but doing so while actively vacuuming combustible dust introduces significant regulatory and safety hurdles.