Meet the Donaldson primary air filter, engineered for top-tier performance in heavy-duty engine applications. Its high-efficiency cellulose media sets a new standard, ensuring exceptional filtration across a wide range of demanding scenarios. To enhance durability, corrosion-resistant steel liners provide robust support to the media, allowing for optimal airflow. The innovative Pleatloc feature takes center stage, ensuring uniform pleat spacing and preventing media from bunching. This not only ensures a longer service life but also maintains consistent filtration efficiency. With ISO 5011 certification, you can trust that this filter meets the highest industry standards. With dimensions of 18 inches in length, 5.78 inches inside diameter, and 9.14 inches outside diameter, it's a precise fit for a variety of applications.