Safety filters serve two functions: they act as a backup to the primary filter and 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. • Designed to plug rapidly if contamination finds its way past the primary filter, alerting operators to an issue. • Recommended that safety filters be replaced with every third primary filter change unless the primary filter has failed.
