vhbw - the clever way High-quality, precision-design exchange filter for your air purifier - 4-in-1 filter: particle filtration, odour reduction, anti-allergenic and anti-microbial impregnation - Reduces the spread of microorganisms on the filter - Made from selected materials - Ideal for allergy sufferers The 4-in-1 filter from vhbw captures dust, pollen, allergens, microbes and harmful gases, amongst others. The built-in particle filter layer reduces virtually all coarse and micro particles. Thanks to the activated carbon layer, unwanted odours and harmful gases such as ozone, nitrogen oxides or sulphur dioxide are extracted. The biofunctional coating with natural polyphenol inactivates free allergens. The additional antimicrobial coating reduces the proliferation of viruses, bacteria and mould on the filter. It is recommended that the filter be replaced every 12 months (depending on frequency of use). CONTENT OF DELIVERY: - 2x 4-in-1 filter TECHNICAL DETAILS: - Dimensions (L x W x