Our Blueair replacement filter is compatible with Joy S, Blue 3210, Pure 411, 411+, MINI, and 411 Auto air purifiers. The Combination Particle + Carbon filter provides dual protection, targeting both gaseous and particulate contaminants. Its advanced polypropylene filter media effectively captures airborne particles like pollen, dust, and pet dander, while the activated carbon layer traps light household odors from pets, cooking, smoke, and more. The twist-and-change design allows for quick, hassle-free replacement, and the filter is recyclable once it reaches the end of its life cycle.