Fit Well: 45i filter replacement compatible with Alen BreatheSmart Flex and 45i air puri-fier, Part #B4-Fresh (Old Part # FL40-Silver-Carbon). Please confirm your machine model before buying to avoid an unpleasant shopping experience 3-Stage Filtration: 45i filters cleans your air through 3 stages of filtration. The pre-filter rem0ves large particIes and the H13 45i True HEPA filter rem0ves tiny particIes from the air, while the activate carbon filter traps unwanted odors and VOCs Excellent Performance: High-density folded H13 HEPA of 45i filter catches more particulate matter in the air while providing smoother airflow. Premium activate carbon filter quickly absorbs strange smells, pet odor and VOC to freshen the air condition Value Pack: 2 H13 HEPA Filter and 4 Pre-filters included. It is recommended to replace the 45i true HEPA filter every 9-12 months and pre-filter every 3 months for optimal performance, or depending on the usage frequency Buy with Confidence: We deliver premium, durable and long-lasting materials, allowing the filter to last longer. If you have any questions about the 45i replacement filters, please let us know and we will help you solve your problem Compatibility
Nisreen’s 45i filter set compatible with 45i air puri-fier

3-Stage Filtration of the 45i Filter
Pre-filter: rem0ves larger particIes in the air like hairs, pet fur, lint and prolongs the life of True HEPA Filter
H13 Grade True HEPA Filter: rem0ves 99.97% of airborne particIes as small as 0.3 microns in size
Activate Carbon Filter: Neutralizes and absorbs strange smells, pet odor, and VOC to freshen the air condition
Package Included
2x H13 True HEPA & Activate Carbon 2-IN-1 Filter
4x Carbon Pre-filters