Environmental vents
ECS Oxygen Heater Switch
This switch is connected to the heaters in the ECS primary oxygen container. The switch has three positions; AUTO, OFF, and ON. It is located below the flight plan display on the center panel. Spacecraft 10 through 12 reidentifies the ECS 02 HEATER switch as 02 HEATER switch and connects to heaters in the ECS-RSS oxygen container.