MAKE SURE YOUR ADVANCED PURIFICATION SYSTEM HAS ENOUGH FILTERS FOR THE YEAR TO ENSURE LASTING PERFORMANCE AND SERVICE. THE FILTER ACTS AS THE FINAL STAGE OF DEFENSE FOR YOUR GLOBAL INDUSTRIAL COMMERCIAL AIR SCRUBBER AND WILL HELP CATCH ALLERGENS DUSTS AND FUMES. THERE IS AN INDICATOR LIGHT ON THE CONTROL PANEL THAT WILL ILLUMINATE WHEN THE FILTER SHOULD BE REPLACED. THIS REPLACEMENT FILTER IS INTENDED FOR THE GLOBAL INDUSTRIAL COMMERCIAL GRADE AIR SCRUBBER / NEGATIVE AIR MACHINE - MODEL 293052.