The Primary is the final filter in the AirBox System. Air
reaching the Primary Filter has been pre-filtered by the Antimicrobial Filter
thereby extending the Primary Filter life.
The Primary Filter should be replaced at least every 3 years
under normal operation. If you operate your AirBox continually at maximum
capacity, you may want to consider a 2 Year replacement cycle. Primary filter Loading does not affect the retention
efficiency of the AirBox. Loading will only reduce maximum flow capacity.
Primary Filter Element: 12’X12”X4” Deep Pleated Extended Surface high face velocity. UL 900 Classified. Disposable.