The DD3 Classic MK2 filter features with Anti- Bacterial Filter. The Silver Nano Technology releases silver ions that inhibits air-borne bacteria from multiplying. Used with the DD3 desiccant dehumidifier air-borne bacteria will be controlled. We recommend that the DD3 Classic MK2 filter should be replaced every 6 months, depending on usage and the environment and cleaned every 2 weeks. Simply brush off the excess dust with a soft brush or a gentle vacuum will suffice, do not wash or rinse as this will remove the Silver Nano on the filter. Compatible Models DD3 Classic MK2 Specification Silver Nano Filter Inhibits Bacteria when used with the dehumidifier YES Applicable Models DD3 Classic MK2 Dimension mm 222 x 240 Color White Note: Due to our policy of innovation some specifications may be changed without notification.