Hmm didnt think of that. I did however find a rdy made filter that have all 3 filter types in the same filter box. Wilfa manufacture a air purifier machine that uses a filter that have all the filters in a replacement box. But it is a little large 27cm x 26cm x 2,5cm however it might be a good thing to maybe use that size due to saturation of the filter over time and the pressure fall. The filter takes down to 0,001 mm particles apparently. Another thing is the price for it is not extreme comparing to buying 3 different products.