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Detail of the suit's vent port.

Cool air from the PLSS was routed through this vent port and into helmet. The back of the helmet served as both a headrest and a vent pad; air flowed through ducts on the back of the vent pad and provided ventilation to the helmet.

 
Vent port in Armstrong's Apollo 11 Backup Suit at Neil Armstrong Air & Space
Time picture taken Tue May 20 13:14:28 2014
Location picture taken Second Floor Lunar Surface Gallery
Neil Armstrong Air & Space Museum
Wapakoneta, OH
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