MAKE SURE YOUR ADVANCED PURIFICATION SYSTEM HAS ENOUGH FILTERS FOR THE YEAR TO ENSURE LASTING PERFORMANCE AND SERVICE. THE ACTIVE CARBON FILTER PULLS IN AND HELPS TO ELIMINATE SMOKE AND ODORS. RECOMMENDED TO REPLACE FILTERS EVERY 6 MONTHS TO MAINTAIN PEAK EFFICIENCY OF THE AIR SCRUBBER. THIS REPLACEMENT CARBON FILTER IS INTENDED FOR USE WITH THE GLOBAL INDUSTRIAL COMMERCIAL AIR SCRUBBER / NEGATIVE AIR MACHINE - MODEL 293052. IT INCLUDES 4 PER PACK. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov -