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The gaseous oxygen vent arm would swing into position over the space shuttle's external tank and then lower a hood, called the "beanie cap", over the top of the tank. Heated gaseous nitrogen flowed into the hood to warm the liquid oxygen vent system at the top of the external tank. This heating action would prevent vapors at the vent opening from condensing into ice that could dislodge and damage the orbiter during launch.
The vent system arm is 80 feet (24.4 meters) long, 5 feet (1.5 meters) wide, and 8 feet (2.4 meters) high. The vent hood is 13 feet (4 meters) in diameter. The arm attached to the fixed service structure between the 207-foot (63-meter) and 227-foot (69-meter) levels.
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