Introducing the Donaldson primary air filter, meticulously engineered to meet ISO 5011 standards, ensuring dependable filtration across a diverse range of heavy-duty engine applications. This 9-inch filter, with a 5.78-inch inside diameter and an 8.4-inch outside diameter, integrates seamlessly into various systems. The heart of its exceptional performance is the high-efficiency cellulose media, providing reliable filtration in demanding environments. Moreover, the filter is equipped with corrosion-resistant, coated steel liners, offering crucial support to the media, maximizing airflow, and contributing to optimal operation. The Pleatloc feature further reinforces durability by maintaining uniform pleat spacing, preventing media from bunching, and ultimately extending the filter's service life.