Nispira 3-in-1 true hepa filter with activated carbon filter replacement compatible with puroair 240 air purifier high quality hepa filter capture 99.97% of airborne particles down to 0.3 microns. activated charcoal help deodorizing the unfavorable household smell such as smoke from cigarette, cooking smell, pet smell or chemical etc. preliminary filter helps extend hepa filter life span by preventing hair, dust and debris from entering. 4 filters included. suggest replacing the hepa filter every 6 months for optimizing performance and best result. hepa filter dimension: 7.5" x 7.5" x 4.3".
