Is your vacuum cleaner starting to lose suction even though the bag isn't full yet? It's probably time to replace the filter. There are different types of filters. Exhaust filters keep the dust in the vacuum, while motor filters protect the motor from dust particles. For people with dust allergies, there are special HEPA filters that hold on to most of the dust, preventing them from being blown back into the room. This will cause less sneezing. Check carefully if the filter you want suits your vacuum. Not all filters fit into every vacuum.