Air filter SYS-AIR HEPACompact and lightweight: Weighing in at 22 lbs (10 kg), this air filter comes in a convenient Systainer M437 format. Powerful air filtering: With an impressive airflow of up to 400 cfm (680 m h), it effectively circulates air in rooms up to 613 ft2 (57 m), achieving three full air changes per hour. Adjustable airflow: Choose between two airflow levels based on dust levels in your environment. Smart design: The airflow disperses upwards in three