Your Dyson DC01, regardless of variant, is fitted with two filters. One is located in a cage slotted into the body of the machine and the other is located under a flap below the cyclone unit.
It is important to pay regular attention to your filters as they allow your Dyson to breathe. Depending on usage, they should be checked every three to six months. You should pay particular attention to your filters if you have had building work carried out. Your Dyson does not like plaster dust.
Most Dyson DC01’s were originally fitted with disposable fibre filters (a few very late machines had washable filters). They are quite inexpensive to buy. You can pick up a pack of eight standard filters (enough for 4 filter changes) for less than £5 here: Dyson DC01 filters
It only takes literally moments to change your filters. It is not necessary to take it to a vacuum cleaner repair shop. Anyone can do this at home with no expertise and no tools.
Click the title “How To Change Dyson DC01 Filters” above to go to the full article with how-to photos.