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highpocket74
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Also from the Donaldson website:
![www.donaldson.com](https://www.donaldson.com/content/dam/donaldson/engine-hydraulics-bulk/imagery/air-intake/replacement-filters/premium-filters/Donaldson-Blue-Air-Stylized6.jpg/jcr:content/renditions/cq5dam.web.1280.1280.jpeg)
Air Filter Efficiency - What Is It and How Is It Measured? | Donaldson Engine & Vehicle
Donaldson air filters in Donaldson air cleaner housings have a 99.95+% minimum overall efficiency. The efficiency of the filter actually improves as dust loads up on the surface of the filter, so an air filter gets better as it gets used.