Introducing the Donaldson safety air filter, a crucial addition to your air intake system. This 15-inch filter, designed to ISO 5011 standards, acts as a reliable backup in the event of primary filter damage or incorrect installation. Its primary role is to prevent contaminants from infiltrating the clean side during primary filter servicing, ensuring smooth and efficient operation. What sets it apart is its rapid plugging feature, which promptly alerts operators if any contamination manages to bypass the primary filter. As a best practice, we recommend replacing safety filters every third primary filter change, unless there has been a primary filter failure. Trust in the Donaldson brand for a dependable filtration solution.