You need to remove the filters to clean them. Generally, filters are located in the front and on the bottom of the case. Each case has filters in different locations, so you should refer to the manual for your case to find the filters. To help maintain airflow, you should clean the removable dust filters on your PC. If you have pets or a lot of dust in your home, you might want to increase the frequency.
We suggest that you follow the same 6-month schedule for routine cleaning of your PC. Most PC builders try to clean their PCs a couple of times a year.
A little preventative maintenance can go a long way to keeping your BLD gaming PC in great shape.