The safety air filter is your reliable backup in critical situations. Measuring 13.00 inches in length, with an inside diameter of 3.48 inches and an outside diameter of 4.58 inches, this filter is designed to step in if the primary filter is damaged or improperly installed. It provides an additional layer of protection, preventing contaminants from entering the clean side of the air intake system during primary filter servicing. Compliant with ISO 5011 standards, this filter is engineered for safety and performance.