The 610B and the 601 are built to purify the air in rooms as large as 679 square feet. They also complete six air changes per hour with an 88 cubic feet per minute (CFM) to 490 CFM air flow rate. Their regular energy consumption is between 35 watts and 120 watts.
The 610B is the larger of the two units, measuring 20 inches wide by 13 inches deep by 26 inches high and weighing 40 lbs. The 601 has the same dimensions but weighs just 35 lbs..
These similar air purifiers have clean air delivery rate (CADR) certified ratings of 438 for smoke, 400 for dust, and 450 for pollen (in 679-square foot rooms). They are also both Energy Star listed.