The Spear & Jackson Air Zone Air Purifier is designed to operate in larger rooms and houses. The single washable reusable filter means no more expensive replacement filters needed so reducing ongoing running costs whilst helping to protect the planet. The Air Zone will eliminate 99.9% of bacteria and viruses and purifies air in a room up to 50m2. Features: 4 x Operating modes including Bacteria Mode designed to kill 99.9% of bacteria and viruses, Smart Mode which automatically adjusts the fan speed based on air quality levels in the room, Dust Mode which quickly boosts the cleaning process when air quality reaches potentially hazardous levels and Silent Mode for undisurbed sleep Reusable filter and cleaning brush included for optimum efficiency plus a filter cleaning indicator to help maintain maximum efficiency by notifying you when the filter needs cleaning Automatic safety cut off for peace of mind Air Quality indicator to help with accurate monitoring of your air quality, temperatu