In addition to combustion air, an engine also requires sufficient ventilation air to dissipate the residual heat. The required volume of ventilation air is about the same as the combustion air needed, which is approximately 6.1m3 per kW (4.5m3 per hp) per hour based on a maximum air velocity of 3m/sec. The design of these VETUS air suction vents is based on these principles. The model numbers (see the tables below) relate to the engine horsepower for which they are suitable. So, for example, a 40hp engine could use 1 x type 40 or 2 x type 20 vents.
The vent frame is polished, and grilles are naturally anodized aluminum. Model number relates to the engine horsepower for which it is suitable
