The motor protection filter protects your cordless handheld vacuum cleaner from contaminants. To ensure the long service life of your cordless handheld vacuum cleaner, it is important to carry out visual checks and maintenance on the motor protection filter at regular intervals. The motor protection filter can be cleaned as many times as necessary. It is recommended to replace the motor protection filter if the filter bag has been damaged or if the motor protection filter is extremely dirty or gummed up.