The Alen BreatheSmart 45i is equipped with a powerful motor and fan that generates an impressive airflow. Ideal for larger rooms, bedrooms, living rooms, and kitchens. 45i circulates clean air indoors by filtering 800 SqFt of air 2x an hour. 45i is designed for comfort and operates at whisper-quiet volumes. In fact, 45i has been validated by SleepScore Labs to improve sleep in allergy sufferers up to 25%. 45i has a unique ambient lighting feature that dims or darkens with one touch, which makes it a great addition to any bedroom. Latest Technology The state-of-the-art advanced air sensor technology displays air quality status in 5 easy-to-read LED colors while auto-mode adjusts the fan speeds for 24/7 protection. The 45i comes equipped with a thick True HEPA H13 medical-grade air filter, plus an extra filter-making the next filter change so easy. All Alen BreatheSmart HEPA H13 filters capture 99.99% of dust, allergens, aerosolized mold, and virus particles to .1 microns. BreatheSmart 45i is made for continuous operation (always on) and the genuine Alen filter provides clean air protection on average for 9-12 months. The Alen BreatheSmart 45i Quiet, Big Room Air Purifier, Plus Extra HEPA Filter is a great choice for bedrooms, living rooms, nursery rooms, home offices, dens, and more. HEPA filtration captures dust, dander, pollen, mold, and other allergens from the air leaving the air cleaner and fresher. About Alen Alen cares about clean air and safety in shared air spaces. Alen solely creates air purifiers and has been a trusted name in air purification since 2005. Backed by the limited lifetime warranty, Alen offers a Forever Guarantee on all Alen air purifier models, enjoy Pure Air for Life with Alen. Where should I place my air purifier? The 45i has 3 air intake sections, 2 on the sides and 1 on the bottom. The outflow is at the top of the unit. Make sure to have clearance on the sides and bottom so that airflow is not restricted or blocked and make sure to have clearance above the unit so that it is not positioned under a counter or window ledge. The ideal placement is on an open wall of a room where the air can flow to and from the unit without restriction. In this position, the air will come in from all sides and out the top creating a gentle, calm circulation around the room, unlike a fan blowing directly on you. What is the pre-filter and how do I clean it? The pre-filter is a black cover that captures the larger debris like fur, dander, and dust and it can be cleaned by gently vacuuming. How do I know when to replace my filter and what type of filter does it use? The air purifier has a filter indicator light that changes color to help notify you that a replacement filter is needed. When the light is yellow, it means it is time to order a new filter, when red it means the filter needs to be replaced as soon as possible. After replacing the filter, make sure to reset the filter indicator light by holding down the button until the light turns green. All Alen air purifiers have different filter sizes, the 45i unit takes filter model B4. I notice that the 45i has an ionizer button, what does that do? Alen’s ionizer creates negative ions which clump tiny particles together making them easier for the purifier to capture. The ionizer feature is optional (can be turned off) and is certified to be ozone-safe by California Air Resources Board (CARB) with less than 0.001 PPM of ozone when engaged. Ozone emissions are zero when the ionizer is off.