U don't need to do much... (Score 1)

Don't worry about the dust. We have computers in a middle school shop room full of dust and sawdust that have been operating for 3 years with no cleaning and no problems. Don't worry about the heat unless its over 95F consistently. If it is just buy a medium size fan and run it continously. Keep the machine at floor level. We have a hot wiring closet with two servers with hot conditions and everything has been running for over 4 years without a hardware failure.