HP Generating Set - Manual (Page 7)

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5.2 Ventilators
To bring in fresh air, there should be an inlet
ventilator opening to the outside or at least an
opening to another part of the building through
which the required amount of air can enter. In
smaller rooms, ducting may be used to bring air to
the room or directly to the engine's air intake. In
addition, an exit ventilator opening should be
located on the opposite outside wall to exhaust
warm air. See Figure 5.3.
Both the inlet and exit ventilators should have
louvres for weather protection. These may be fixed
but preferably should be movable in cold climates.
For automatic starting generating sets, if the
louvres are movable, they should be automatically
operated and should be programmed to open
immediately upon starting the engine.
FIG 5.2 TYPICAL ARRANGEMENT FOR PROPER VENTILATION WITH MULTIPLE GENERATING SETS