The air flow from the scavenging space must always be protected by plate type check valves and under no circumstance may other devices be used.

A suitable gasket for the interface of both manifolds is necessary to prevent recirculation of scavenging gases, while additionally minimizing exhaust gas leakage.

The scavenging space is to be permanently connected to an approved fire extinguishing system, entirely separate from the fire extinguishing system of the engine room.

The required equipment for a crosshead type engine is totally dependent upon manufacturers ability to placate market demands.