You choose a dust extractor depending on the usual type of floor that you finish, the areas that you work on and the type of floor finisher that you use. If your work involves mainly large concrete surfaces, then you will have completely different requirements than if you sand wooden floors in apartments and houses. Whichever you choose, you know that the job will go much faster and that it will be done better if you have effective source extraction combined with a good air cleaner. It will also make you feel better.