Attributes . Flexible 42" X 48" Work surface, Automatic Reverse-Pulse Self-Cleaning System, 5 Stage Spark Arrestance System?, High Capture Face Velocity (200 FPM), 5Hp Tefc Motor Producing 4400 CFM of Airflow, Washable Reusable Pre-Filter, Low Cost Replacement Filters, Interchangeable Gratings . Names