I inherited a poorly installed and maintained racked server array with my job. The room has been dusty for several years without cleaning. The dust is mostly from the acoustic suspended ceiling tiles, that are now removed. There is also a good amount of ordinary dust bunny dust.

The servers are running 24/7 and cannot easily be shutdown due to the round the clock nature of the business.

I need to get advice on how to proceed with a needed cleaning. If possible, with the servers running. If they must be shutdown, or not, what is a safe, but effective means of opening and blowing out racked servers? (I don't know this because I have only worked in clean facilities before and have never had to deal with this situation.) I do not want to create more trouble than already exists.