The Blueair 600 series air purifiers are the best you'll find on the market today.

The Blueair 603 and Blueair 650E have the highest test results you can get in the Association of Home Appliance Manufacturers Clean Air Delivery Rate (CADR) program.  The higher your CADR number the faster your air is filtered.  The Blueair 600 series units are the fastest air filter units in the world.

The Blueair 603 and Blueair 650E are made for large rooms up to nearly 700 square feet, like family rooms, master bedrooms, offices or basements.  The HEPASilent filter gives you cleaner air faster and with less noise than similar models which makes these units ideal for people with asthma and allergies.

No ozone, low energy consumption, the best in mechanical and electrostatic filter technology and a durable steel housing are some of the best features of these units.  The multi-directional SurroundAir system gently diffuses air through an area six times larger than average air purifiers.
 

GO Smokestop

The optional Smokestop filter improves performance even more by eliminating volatile organic compounds, gasses and odors.
 

The differences between the 603 and 650E

The 650E covers up to 698 square feet while the 603 covers up to 640.  Both filter air up to 99.97% contaminate free and are Energy Star certified.  The 650E has sensors that continuously monitor the air - in auto mode it will monitor the air and regulate its own speed depending on the amount of particles and gasses in the air.  Total specifications are below.
 

650E Specifications and features

• 698 square feet
• Energy Star Certified
• AHAM Certified
• 99.97% filtration
• Electronic gas sensor
• Electronic particle sensor
• Auto mode
• On/off timer
• Replace filter light
• Five year warranty

603 Specifications and features

• 640 square feet
• Energy Star Certified
• 99.97% filtration
• Available in white
• Magnetic timer to let you know when to replace filters

Common references:  Blueair, Blue Air

Return policy: $25 cleaning fee will be charged if returned within 30 days of purchase if unit is in salable condition.