Sophisticated materials and precision engineering allow the filter to clean indoor air without the noise associated with less advanced units. On the lowest setting, the units emit no more sound than a desktop computer. To achieve exceptionally quiet operation, this air cleaner's patented HEPASilent™ filter technology traps particles two ways: with mechanical and electrostatic filters. This combination creates a filter system through which air flows freely. Most air cleaners require a powerful, noisy fan to pull air through densely packed filters. Since air passes easily through the filter media, the fan doesn't have to work as hard or as loud. Even the housing is designed with quiet operation in mind, replacing sound-sonant plastic with noise-muffling steel.

Surround Air

Instead of discharging a windy stream of filtered air, the Blueair 250 E diffuses air gently through an area six times greater than the average air cleaner of the same class. Operating on its lowest setting, the 250 E produces virtually no noticeable draft, while still providing an exceptional air exchange rate. The SurroundAir™ system achieves peak performance without annoying drafts by drawing in dirty air from the sides and bottom, moving it through a less dense filter media, and releasing clean, filtered air from the sides and top.

Low Energy Cost

A phenomenally low power usage means that you can run this air cleaning system 24/7 without a jump in electricity consumption.

10-Year Warranty

Blueair warrants that your air purifier will be free from defects in material or workmanship for a period of ten (10) years from the date of purchase provided that you have completed and returned your warranty registration to Blueair, and that the filters are replaced with original replacement filters at least once every six (6) months (the Limited Warranty). Within the first 30 days of purchase Blueair will replace the defective unit at no charge to you and reimburse any shipping charges. After 30 days, Blueair's obligation and liability under this Limited Warranty is limited to repairing or replacing (at its sole discretion) the defective unit and paying the freight cost of returning the unit to you. The Limited Warranty does not cover replacement filters.