I have that same model of air purifier in my bedroom. I have a larger unit of the same brand in the main part of my home. I let a roomba type vacuum cleaner run in my bedroom twice a week. I dust weekly. I wash my sheets weekly. I bought new pillows and have covers on them under the pillowcases. This has helped a good bit. Dusting and vacuuming frequently will really help! If your computer is covered with dust by the fan, you are not doing enough, and you should clean that as well. You just have to proactive about your dust!