45i Replacement Filter Fit for Alen BreatheSmart Flex 45i Air Purifier,3-in-1 Grade Fresh Filter, B4-Pure,2 H13 True HEPA Filter with 6 Carbon Pre-Filters

Compatible ModelsThis 45i replacement filter fit for Alen BreatheSmart 45i and Flex air purifiers, corresponding to Part # B4-Pure (replaces old # FL40). | 3-In-1 Advanced FiltrationThe filter fit for alen air purifier filter replacement features a comprehensive 3-stage system: fine nylon pre-filter for large particles; H13 Grade True HAPE filter that captures 99.97% of airborne particles as small as 0.3 microns; activated carbon layer for neutralizing odors, VOCs, and gases. | Superior PerformanceEffectively tackles dust, pet dander, lint, smoke, etc. The enhanced carbon formulation is particularly effective against persistent household odors from pets, cooking, and wildfires, ensuring fresher indoor air. | Value PackThe package includes 2 complete 3-in-1 HAPE filters and 6 extra activated carbon pre-filters. For optimal performance, replace the main filter every 9-12 months and the pre-filter every 3 months. Simple, tool-free installation. | Smart ResetAfter installing the new filter, press and hold the "FILTER" reset button on your purifier for 5 seconds until the indicator light turns green. Backed by responsive customer service for any installation or usage inquiries.