How many oxygen masks are located at each PSU on the ERJ 175?

Each Passenger Service Unit (PSU) on the ERJ 175 is equipped with three oxygen masks. This setup is designed to provide sufficient oxygen supply for each row in a situation requiring supplemental oxygen due to cabin decompression or other emergencies.

The inclusion of three masks accounts for the potential need of passengers sitting in close proximity to one another, ensuring that additional masks are available when necessary. This arrangement helps maintain safety and compliance with regulations regarding passenger safety in aircraft.

Other numbers of masks per PSU might seem plausible, but the design and safety protocols of the ERJ 175 specifically dictate three masks to efficiently serve the passenger capacity while adhering to safety standards.