The Chinese word for exhaust is
废气

fèi qì

Chinese Definition

用盡
1. v. to exhaust; to use up completely; to deplete

用尽
1. Simplified form of 用盡

盡
1. to end; to finish; to be exhausted
取之不盡 - to be inexhaustible
想盡辦法 - to come up with every possible solution
2. to reach the end
盡頭 - the end
山窮水盡 - having no more options; at the end of one's rope
盡善盡美 - perfect; flawless
3. to exhaust; to use to the fullest extent
盡最大的努力 - to exert one's utmost effort
盡心竭力 - to do something with all one's heart and all one's might
4. to die
自盡 - to commit suicide
5. all; completely; entirely
他說的話不可盡信。 - You cannot believe everything he said.
6. Variant of 儘