Introducing the Donaldson primary air filter, a product meticulously designed to meet ISO 5011 standards, offering dependable performance. Its high-efficiency cellulose media ensures optimal filtration across a broad spectrum of heavy-duty engine applications. The filter is reinforced with corrosion-resistant, coated steel liners, providing essential support during operation to maximize airflow and enhance engine efficiency. Notably, the Pleatloc feature ensures uniform pleat spacing, preventing media from bunching and thereby promoting a longer service life. Compliant with ISO 5011 standards, Donaldson upholds a commitment to industry benchmarks. With a length of 18 inches, an inside diameter of 5.86 inches, and an outside diameter of 9.22 inches, the Donaldson primary air filter stands as a reliable choice for maintaining engine performance.