At what pressure should the air filter be changed on the RB-M 45?

The air filter on the RB-M 45 should be changed when the differential pressure reaches 20 inches of water (H2O). This pressure level is critical for ensuring optimal performance and air flow through the engine's intake system. When the pressure differential exceeds this threshold, it indicates that the filter is becoming significantly clogged with debris and contaminants, which can restrict airflow and negatively impact engine efficiency. Regular maintenance, including timely filter changes at this pressure point, helps maintain the boat's operational capabilities and longevity. Monitoring this parameter is essential for ensuring that the engine receives sufficient clean air for combustion, thus supporting safe and effective vessel performance.