Safety filters have two functions: they act as a backup to the primary filter and protect the engine during primary filter servicing. • They serve as a backup filter in case of primary filter damage or improper installation. • They prevent contaminants from entering the clean side of the air intake system during primary filter servicing. • They are designed to plug rapidly if contamination gets 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.
