A ventilator

A ventilator was a type of technology used to cool the air.

In 2267, the personnel at a laboratory on Deneva closed the ventilator in an attempt to shut out something from entering their facility. Spock noticed this and mentioned it to Captain James T. Kirk, adding that their efforts had apparently failed. (TOS: "Operation -- Annihilate!")

A ventilator was one of the items in the office of Dixon Hill. (TNG: "The Big Goodbye")

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