Blueair is a Chicago-based air filtration company that has been in business for over two decades. Their air purifiers are designed and manufactured in Sweden and assembled in China. The HealthProtect 7470i is Blueair's quietest air purifier, focusing on allergies and boasting an attractive tower design. It features the HepaSilent filter, which reduces the noise levels generated by the Classic 680i's higher maximum airflow.
Regular filter replacement is essential for optimal performance throughout the life of the system. The filter has six layers and can provide up to two years of super-silent filtration. Tests have shown that units equipped with particulate filters, carbon filters, and SmokeStop filters all yield positive results, with SmokeStop filters providing the most effective results. The HEPA filter for medical use can filter out 99.97% of polluting particles as small as 0.3 microns, as well as 95% of particles measuring 0.1 microns or less.
The Blueair 221+ is the best Blueair unit available, and one of the best-performing air purifiers overall. It can filter out particles smaller than 0.1 microns, reducing the accumulation of allergens, dust, mold, pollen, pet dander, and other contaminants that may be trapped in the filter. Additionally, its active carbon filter absorbs all undesirable odors and other volatile organic compounds (VOC). In air purifiers larger than 500 square feet, noise levels may be higher than in smaller Blueair Pure Blue air purifiers. The HepaSilent technology filters 99.97% of particles at 0.1 microns when operating at its lowest speed.
Different Blueair air purifiers are better suited for different sized rooms and allergies. The Blue Air filtration system consists of standard prefilters, activated carbon filters, and HEPA filters. To maximize filter efficiency, the Blueair unit negatively charges particles before they reach the filters.