Foam filter

A foam filter is a type of filter made from a porous, sponge-like material, most commonly polyurethane foam. In a vacuum cleaner, it primarily serves to capture coarser debris such as hair, pet hair, or larger dust particles, thereby protecting the motor from damage and clogging. It is often placed in front of the motor as a so-called "pre-motor filter," but it can also be part of the exhaust filtration. It is a washable and reusable part. To maintain the suction power and proper function of the vacuum cleaner, it is necessary to regularly clean the filter under running water and let it dry thoroughly before returning it to the appliance.