Embraer EMB145 Operation Manual page 2079

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AIR CONDITIONING

AND PRESSURIZATION

When the ECUs air supply is shut off in flight, the emergency ram air is

activated and the ram air valves are opened automatically, allowing

ram air to be routed to the distribution lines. Ram air may also be used

to ventilate the airplane interior for cabin smoke evacuation and cabin

ventilation purposes with the airplane depressurized and the ECUs

NOTE: The Pneumatic System automatic logic closes the left Pack

Valve whenever the anti-icing system is operating below

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