Did you know the air quality inside your home can fluctuate, depending what is introduced to your home? Cooking, burning food, smoke, pollen, dust and cleaning products can all lower the quality of your air. With 4 powerful fans and intelligent air quality monitoring, the Shark Air Purifier 4 automatically removes allergens, mould, bacteria and other particles from your air for all-day clean air confidence. How does the Shark Air Purifier 4 work? Delivers clean air