How many outflow valves does the pressurization system incorporate?

The pressurization system of the CRJ550 incorporates one outflow valve. This single outflow valve is crucial for maintaining cabin pressure by regulating the amount of air that exits the pressurized cabin. It opens and closes to manage the cabin altitude effectively and ensure a safe and comfortable environment for passengers and crew during flight.

This design allows for efficient control of cabin pressure, simplifying the systems involved and making the aircraft lighter, which can contribute to overall performance. The existence of only one outflow valve means that the pressurization system is designed with a focus on reliability and ease of maintenance, as opposed to systems with multiple valves that may introduce additional complexity.