NOTEPeriodically remove the pleated filter and pressure wash (from 25cm away) to remove trappedparticulate. DO NOT WASH the Dust Pad.When to doFrequent vacuum cleaning will prolong the life of the pleated filters. After several months of use,if the digital gauge reading drops by 500 to 2500 cfm, even after vacuum cleaning, it is necessaryto pressure wash the pleated intake filters.Carbon FiltersCarbon filters are NOT cleanable.Replace the Lower Carbon filter when it weighs 26 lbs (11.8 kg).The Upper Carbon Filter cannot be cleaned. When its saturation weight of 42lbs (19 kg) isreached, it must be replaced.Changing the Upper Carbon FilterProcedure1. Turn off the Duster.2. Open the 4 latches and remove top shroud and filter.3. Install new Upper Carbon filter and reinstall the top shroud.4. Close latches.IMPORTANTNote that it is important that the filter is installed in the correct orientation - seediagram - failure to install correctly will severely restrict airflow.Cleaning and Changing Filters202 Chapter 10 - Maintaining the Duster 3000FC Air Filtration System