The BISSELL™ air400 Air Purifier is clean air made easy. We know life happens. Between the kids and pets, there are odors, allergens, dust, and other things we can’t always see in our air that needs to be cleaned. That’s where air400 shines. This machine is designed to perform from the inside, out. It captures airborne particles and odors with three stages of filtration and has an automated CirQulate™ System that automatically increases fan speed as your indoor air quality decreases.