Experience cleaner, fresher air with the BLUEAIR genuine air purifier filter replacement designed specifically for Blue Pure 411 Auto, 411, and 411+ Air Purifiers. This authentic 411 replacement air filter delivers superior performance through advanced HEPASilent dual filtration technology, combining mechanical and electrostatic filtration to provide more clean air faster while operating with less noise and energy consumption than traditional HEPA air filters alone. Engineered to capture at least 99.97% of microscopic airborne particles down to 0.1 microns, this air purifier filter replacement effectively removes viruses, smoke particles, pet dander, pollen, mold allergens, and dust from your indoor environment. The integrated activated carbon filter component traps light household odors from smoking, pets, and cooking, ensuring comprehensive air purification for your home or office space. Designed specifcally for the Blue Pure 411 Auto, 411 and 411+ HEPASilent Air Purifier, this air filter for air purifier fits seamlessly into your Blue Pure 411 Auto, 411 or 411+ unit.. The air filter maintains the highest performance standards while ensuring quiet operation, making it ideal for bedrooms, living rooms, and workspaces. This air filter for air purifier comes from the most awarded air purifier brand in the US, backed by independent testing for performance verification. The air purifier filters meet AHAM Verifide standards for Clean Air Delivery Rate (CADR) and carry Quiet Mark Certification. For optimal air purification performance, replace your Blue Air filter every 6 months or when the replacement indicator activates. Regular air purifier filters replacement ensures consistent air quality improvement and maintains your air purifier's efficiency. This genuine replacement filter is not compatible with 411i Max and 411a models - it is specifically designed for 411, 411 plus, or 411 Auto series only.