Count on the Donaldson safety air filter to serve as a reliable backup in case of primary filter damage or incorrect installation. Engineered to meet ISO 5011 standards, this filter acts as a crucial barrier, preventing contaminants from infiltrating the clean side of the air intake system during primary filter maintenance. Notably, it features a rapid plugging mechanism that activates if any contamination manages to bypass the primary filter, promptly alerting operators to address the issue. With a length of 15.15 inches, inside diameter of 4.42 inches, and outside diameter of 5.56 inches, this safety filter ensures your engine remains well-protected.