This filter is only compatible with the Blue Pure 3350i (311i) Max Air Purifier. Find the Blueair model name on the label inside your air purifier. Designed for easy replacements, ensuring hassle-free maintenance for continuous clean air Crafted with durable materials for a long-lasting filterEffectively captures allergens like dust, pollen, and pet dander Particle & Carbon Our original filter. Removes allergens and traps light household odors from pets, cooking and smoke Accurate filter lifetime tracking Blueair’s proprietary RealTrack algorithm accurately calculates the remaining filter lifetime based on fan speed, usage time and pollution levels. Main FilterCaptures airborne particles including, PM 2.5, pollen, dust mite matter allergen & pet dander allergen Activated Carbon Traps light household odors from smoke, cooking odors and more Depending on usage, your filter will last up to 9 months. It’s important to change your filter when needed because dirty filters clean the air less efficiently, reducing the purifier's ability to capture pollutants and affecting overall air quality in your space. A filter change indicator light that will alert you when it's time to replace the filter. You can also check the status via the Blueair app for models with smart capabilities. After replacing your filter, you can reset the filter lightindicator by pressing the fan speed button for about 15 seconds (until all theLEDs of the interface light up). The filter light indicator will turn off. Thenrelease.