Introducing the Donaldson air filter, meticulously designed to act as a fail-safe in scenarios involving primary filter damage or improper installation. Its primary function is to prevent contaminants from infiltrating the clean side of the air intake system during primary filter servicing, ensuring optimal engine performance. Engineered to swiftly clog in the event of contamination breakthrough, it serves as an immediate alert to operators, highlighting any potential issues. We highly recommend replacing safety filters every third primary filter change, unless there has been a primary filter failure, in order to maintain peak efficiency. This filter adheres to ISO 5011 standards, ensuring reliability and quality. With a length of 14 inches and an outside diameter of 2.95 inches, it perfectly aligns with industry specifications.