Where compression ignition type engines are used, the pump house must have adequate natural and mechanical ventilation for engine aspiration.

Mechanical extractor fans are sized according to the engine size.

Mechanical extraction is positioned at high level close to the roof or ceiling of the pump house whereas louvers shall, where possible, be positioned at a lower level in order to draw air across the diesel engine.

Louvers or air bricks alone are not deemed to provide adequate ventilation.

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