Donaldson presents a reliable safety air filter, ready to step in as a backup in case of primary filter damage or improper installation. Its primary function is to safeguard the clean side of the air intake system, ensuring no contaminants breach during primary filter servicing. Engineered for swift plugging, it acts as a vigilant alert system, notifying operators promptly if any contamination slips past the primary filter. In line with ISO 5011 standards and crafted from top-grade safety media material, this filter ensures optimal performance. We recommend replacing safety filters with every third primary filter change, unless a primary filter failure occurs. With a length of 16 inches, an inside diameter of 5.28 inches, and an outside diameter of 6.4 inches, it precisely aligns with industry requirements.