i see what hes asking
i believe he manufactures activated carbon for products like respirator filters, fish tank filters, etc
there is quite a bit of dust involved in the process

so the question thats most important:
is there a flash fire hazard from airborne dust ?
i would imagine you would want a refinery package in combustion engine model to keep the particulates out of the engine compartment

or a dusty environment package in an electric

maybe even an explosion proof electric machine and battery depending on how dangerous the dust is (ee rated)

i have no experience with a customer like you
but
from what i read on the internet about manufacturing activated carbon it seems that the dust poses no special dangers that aren't associated with other small airborne particles but needs to be managed