The motor pre-filter is a complete replacement for the original Dyson filter 912153-01. It is washable and is placed before the motor. It features a filtration layer made of microfleece, which improves filtration efficiency. After washing, allow it to dry thoroughly before use. The HEPA filter (High Efficiency Particulate Air) ensures that dust particles from the outgoing air do not return to the atmosphere. It is suitable for all versions of the Dyson DC16 vacuum cleaner.