When the RED LIGHT shows on your Crystal Aire Hepa Purifier then you know that it is time to replace the filter. The filter should be changed when the filter looks grey instead of blue. The filter usually lasts 6 to 12 months. Your filter can be cleaned with a vacuum cleaner once a month. The Spare filter for the CF-8128NUAS-1 Hepa Aire Purifier. It is made from layers of small, sticky fibreglass fibres that are interwoven. They remove 99.97% of dust, pollen, mould, bacteria and other airborne particles that are larger than 0.3 microns.
