The 4 in 1 DD1 Mini filter features with Anti- Allergy, Odour Control, Bacterial Filtration & Virus Filter. We recommend that the 4 in 1 DD1 Mini 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 the filter. Compatible Model DD1 Mini Specification 4 in 1 Filter Anti- Allergy YES Odour Control YES Bacterial Filtration YES Virus Filter YES Applicable Models DD1 Mini Dimension mm 235 x 180 Color Light Blue Note: Due to our policy of innovation some specifications may be changed without notification. FEATURES 4-in-1 Function - Anti-Allergy, Odour Control, Bacterial Filtration & Virus Filter. Controls allergens Suitable for asthma, hayfever and allergy sufferers, effectively helps controls mould, condensation, bacteria growth, house mites and odour. Do not wash the 4 in 1 filter. Clean only with a vacuum cleaner or a soft brush. The filter should be replaced every 6 months, depending on usage and the environment. Compatible Model DD1 Mini