Introducing the Donaldson safety air filter, a reliable backup system for heavy-duty air intake filtration. With a length of 14 inches, an inside diameter of 5.29 inches, and an outside diameter of 6.39 inches, this filter is meticulously designed to serve as a fail-safe in case of primary filter damage or improper installation. It effectively prevents contaminants from infiltrating the clean side of the air intake system during primary filter servicing, ensuring smooth operation. Should any contamination breach the primary filter, this safety filter is engineered to plug rapidly, promptly alerting operators about potential issues. As a maintenance recommendation, we advise replacing safety filters with every third primary filter change, unless a primary filter failure occurs.