45i Replacement Filter for Alen Smart Flex Bh400 & 45i Air Purifier

Compatible Model: This 45i filter replacement compatible with Alen Smart Flex and 45i air purifier, Part #B4-(Old Part # FL40-Silver-Carbon), please check your unit model before placing an order | Effective Filtering: The filter for alen air puri-fier capture large particulate matter, such as hair, smoke, pet dander, this filter can clean 99.97% of airborne particles as small as 0.3 microns particles and household odors. Filter made of FSC-Certified paper | Activated Carbon Pre-Filter: The high-performance activated carbon layer fit for alen air puri-fier filter replacement can capture unwanted odors, cooking odors, smoking and other odors | Package Including: The package includes 2 True HEPA Filters + 4 Activated Carbon Pre- Filters fit for alen air purifier filter replacement, which are cost-effective and can save you money | Easy Installation: Replacing the 45i filter is very simple and does not require any tools, to ensure efficient operation of the filter, we recommend replace the true high-efficiency HEPA filters every 6-8 months and the pre-filters every 3-6 months, depending on usage and environmental conditions