I hemmed. I hawwed. And I sneezed myself silly with allergies before I just took the plunge and bought an air purifier, the Bionaire BAP412. There are many factors to consider when buying an air purifier: will it really work? How difficult is it to find replacement filters? How much wattage will it use and add to your electricity bill? How loud will it be? Some of these questions depend on your personal sensitivities, but About has a good, ...