Air cleaners reduce or deactivate airborne contaminants to help improve indoor air quality and neutralize odors in homes and offices. Also known as air purifiers, they have lower airflow and are quieter than negative air machines, which makes them suitable for cleaning the air in occupied indoor spaces. Portable air cleaners stand on a floor or desk and can be moved to different locations as needed. Wall-mount air cleaners keep floors and desks clear and are suitable for spaces where air cleaners do not need to be moved. In-duct air cleaners and air cleaners for ductless air systems install into HVAC systems to clean the air in all rooms that are connected to the HVAC system.