Introducing the Donaldson primary air filter, a reliable choice tailored for a wide range of heavy-duty engine applications. With a length of 12.25 inches, inside diameter of 2.21 inches, and outside diameter of 4.42 inches, this filter boasts high-efficiency cellulose media, meeting ISO 5011 standards, and ensuring top-notch filtration performance. Its durability is further enhanced by corrosion-resistant, coated steel liners that support the media during operation, facilitating maximum airflow for efficient engine function. Notably, the Pleatloc feature ensures uniform pleat spacing, preventing media from bunching and promoting an extended service life.