This high performance triple filter with activated carbon removes odors, smoke, chemicals and more from the air entering the dehumidifier. A must for allergy and asthma sufferers, this filter is lab tested to trap 99.97% of harmful airborne particles, bacteria, germs and pollutants. Changing the filter is not mandatory because the carbon filter that needs to be replaced is supplied separately. Change the filter if it is worn, torn, deformed. Supplied in a two-pack. Dimensions Height, Length, Width 240*140*4 mm