There is more than one type of Dyson Airblade HEPA filter, so check with us to make sure you order the right one. This HEPA filter is responsible for keeping your toilets as bacteria-free as possible by filtering the air, which is discharged during drying, and to a great extent. These HEPA filters usually require changing after about 700,000 cycles, but it’s a good idea to check their condition at least once a year. If you notice that the dryer is losing some performance, the filter is the first thing to change.