Safety filters have two functions: to act as a backup to the primary filter and to protect the engine during primary filter servicing. • Serve as a backup filter in case of primary filter damage or improper installation. • Prevent contaminants from entering the clean side of the air intake system during primary filter servicing. • Are designed to plug rapidly if contamination finds its way past the primary filter, alerting operators to an issue. • It is recommended that safety filters be replaced with every third primary filter change unless the primary filter has failed.
