Anyone that owns a PC has to contend with dust buildup. It’s the bane of PC cooling. Even if you keep your area clean, some buildup will occur over time. It’s made much worse of you have a carpeted room and especially if you have pets.
You can configure your fans however you like, use as many dust filters as you can fit, and make sure your PC is well away from carpets and floor-bound fluff, but at some point, the dust comes for us all.
You can’t escape it, and it’s a good idea to clean your PC now and then if you want to keep your components’ temperatures manageable. Here are the methods we use to safely and thoroughly clean out our computers.
Source: https://www.pcgamer.com/how-to-clean-your-computer-case/