Dust causes allergies for many people. Good filters are indispensable in those cases. One of the best exhaust filters for allergies is a HEPA filter. This stands for High Efficiency Particulate Air, and also keeps the smallest dust particles in the bag. The higher the HEPA filter, the better. A vacuum with HEPA 13, HEPA 14, or HEPA 15 filter is suitable for allergies.