filtAIRS - Tried and tested filters in OEM quality for years; the innovative filtAIRS combination filter combines a HEPA filter with a highly efficient activated carbon layer; filter technology for effective air purification - for the highest demands and a healthy home. Filters harmful substances up to 0.02 microns; effectively protects against allergens (pollen, dust, pet allergens), mould, fine dust, smoke, odours, gas and much more. Suitable for Philips air purifier AC4072/11