Emerson 10C18E - 41000 is a self-contained drop-in electronic air cleaner designed for commercial and light industrial applications in enclosed areas where it is not practical to have central air cleaning or where central systems are overloaded. It uses an electrostatic process to remove smoke, dust, dirt and pollen particles from the air with an efficiency of up to 90% at low speed and 65% at high speed. The variable speed fan allows you to adjust the airflow from 200 to 1000 cfm, making it suitable for a wide range of applications.