Alen 45i HEPA Air Purifier, Ultimate Filter, Covers 1,900 Sq Ft

The Alen BreatheSmart 45i is ideal for bedrooms and other rooms up to 1900 sq. ft. Proven to improve sleep by an independent SleepScore Labs study, the BreatheSmart 45i emits a soothing pink noise that boosts frequencies in the lower octaves, so you wake up feeling rested. Alen air purifiers offer superior performance through the combination of a powerful fan, quiet motor, and advanced filtration technology to deliver and maximize airflow while minimizing noise. Our medical-grade filters capture particles as small as 0.1 micron, removing even the tiniest pollutants including dust, pollen, pet dander, spores, and more. Laser sensor technology detects when particles are present and auto-adjusts fan speed, so you don’t have to. The 5 color-coded rings show your indoor air quality at a glance and let you see how Alen is working to clean the air quickly and efficiently. Get real-time air quality insights, view historical trends, or control your purifier remotely using the Alen Air app.
Product Dimensions ‏ : ‎ 15 x 8.5 x 25 inches; 14 pounds
Item model number ‏ : ‎ 45i_V2
Date First Available ‏ : ‎ September 1, 2025
Manufacturer ‏ : ‎ Alen
ASIN ‏ : ‎ B0FPCVBMLJ
Best Sellers Rank: #195,054 in Home & Kitchen (See Top 100 in Home & Kitchen) #243 in HEPA Filter Air Purifiers
Customer Reviews: 4.4 4.4 out of 5 stars (32) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
MEDICAL-GRADE HEPA FOR LARGE ROOMS: The Alen BreatheSmart 45i air purifier for home captures 99.9% of airborne particles as small as 0.1 micron – going beyond the standard 0.3-micron HEPA threshold – eliminating dust, allergens, viruses, pollen, wildfire smoke, odor & mold with every pass. With coverage up to 1,900 sq ft across four fan speeds, it delivers powerful, consistent clean air for large bedrooms, living rooms, family rooms, and open-concept spaces throughout your home
ULTIMATE FILTER – MAXIMUM ODOR & VOC CONTROL: Alen’s proprietary carbon catalyst blend goes further than activated carbon alone – breaking down mold, heavy smoke, and the toughest pet odors in multi-pet or high-traffic homes. Built for households that consistently generate more odor and smoke than a standard HEPA filter can handle on its own. Includes a 9-12 month filter life with continuous 24/7 use for the strongest performance in the lineup
SMART AUTO MODE & AIR QUALITY MONITOR: The 45i uses built-in optical sensors to continuously detect airborne particles in real time, then automatically adjusts fan speed to match your indoor air quality. A color-changing ring displays your air quality level at a glance, while the Alen Air app lets you monitor and control your home air purifier remotely, set schedules, and track air quality from anywhere
WHISPER-QUIET BEDROOM AIR PURIFIER: Running as low as 24 dB and ranking among the quietest 20% of air purifiers for home on the market, the 45i is engineered for peaceful, uninterrupted sleep. Every fan speed – from low to high – produces soothing pink noise backed by a peer-reviewed SleepScore Labs study, helping you fall asleep faster and wake up refreshed. Ideal for bedrooms, nurseries, home offices, and any space where silence matters
LIFETIME WARRANTY & SCENTRA AROMATHERAPY: Alen stands behind the BreatheSmart 45i with a lifetime warranty – if your purifier ever has issues, Alen will fix or replace it at no cost, must have an active filter subscription and product registration. Alen also makes Scentra, a mood-boosting aromatherapy line designed to pair intentional scents with your purified air for a more intentional home