To everyone out there- Our stage floor was recently sanded and refinished with the dimmer packs on, naturally. Unfortunately I noticed that they packs are FULL, yes full of dust and saw dust. The fan casings are caked up around the edges, and some of the vent holes on the front of the dimmer packs are actually clogged clear closed. It might be useful information to everyone, but I would really like to know what the best method is to clean them. Have a professional do it? Can I unplug them and use compressed air? Obviously liquids are out. Anyone care to offer some suggestions? What about other annual or periodic maintenance? How much of it can I do, and how much needs to done by a professional? Thanks, any help and suggestions would be most appreciated!! P.S. I have NSI DS12-24 and NSI NRD9000 2.4Kwz dimmer packs in case you are wondering.