These 2" pre-filters filter out larger airborne contaminants in the air, and serve to protect the HEPA filter behind it and ensure it performs optimally. It is the first step in the filtration process. We recommend that the pre-filter be changed out weekly under heavy/substantial use, e.g. visibly mouldy environments, heavily fire damaged environments, and construction sites. * This product is for use with our 500 CFM Air Scrubbers, 1000CFM Air Scrubbers & AS650 Air Scrubber * Available for bulk purchase
