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Well All hot air balloons have a variable release valve in the top of the balloon which the pilot can use to control the altitude of the balloon..This valve when opened to a certain point allows hot air to slowly escape from the top of the balloon and the balloon will slowly decend,the exchange is controlled so the balloon maintains its size...by use of the release valve and the burners the pilot can control the rate of decent to a nice soft landing....The release valve is also used to quickly deflate the ballon once it has landed...

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