An RC electric ducted fan engine producing 8 lb of thrust in a closed container generates a pressure based on the force divided by the area of the duct. The pressure calculation depends on the duct's cross-sectional area; for a 4-inch diameter duct, the area is approximately 12.566 in². This results in an internal pressure of about 0.636 psi when the engine runs continuously. The fan acts as a compressor rather than simply blowing air, creating a net pressure differential within the container. Understanding these dynamics is crucial for applications like battery-powered supercharging in vehicles.