Designed for the medical industry, Dutch Breeze Filters are the only carbon air filters certified by the European Clean Air Act (ECAA). They effectively remove 99.5% of airborne pathogens and are widely used in hospitals. Dutch Breeze Filters are also used for many commercial applications where industrial odor control is required. Dutch Breeze Filters contain an expanding foam disk to ensure that the carbon stays tightly packed without air leaks. Replacement pre-filters available for all sizes. Dutch Breeze Filters use the highest quality carbon mined from pre-Cambrian ore (not from burned coco coir). The carbon grain size of our Carbon Air Filters is 3mm, while the leading competitor uses 5mm. This smaller carbon grain ensures that Dutch Breeze Filters have more surface area contact between the air stream and the carbon bed to clean air more effectively.