When choosing an air purifier / cleaner with a washable filter you should look for 3 things: Is it safe, Does it really work, and will it last? We will cover these items as this article continues. Some other things to consider are: Is it made in the USA, Is it recyclable, is it easy to wash, will this air purifier last me more than 7 years etc.? All of these questions are important, your purchase matters. Whether for your home or business the air purifier needs to do the job you bought it for.