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I'm looking for a word to describe a system that filters certain gases from a space and 'exhales' them outside. What verb can be used to describe that action?

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Like a hot gas filtration system? What kind of gases? In medicine, there are anesthetic gas scavenging systems. Can you provide a little more context? –  JLG May 5 '12 at 17:39
    
As JLG says, without more specifications it is difficult to answer to this question. –  user19148 May 5 '12 at 18:05
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1 Answer

I think you are looking for the word exhaust.

expel (gas or steam) from or into a particular place.

Exhaust systems are typically part of car engines, but can also be found on stoves or other gas-producing systems.

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