What is the name of the equipment which removes carbon monoxide?

Answer 1

De-carbon monoxide machine-a-ma-bob

It depends on what the CO is being removed from.

Removing it from smoke effluent might be called a "scrubber" or "after-burner".
Removing from human bloodstream might be called "chelation therapy".
Removing it from a tank might be called "releasing the gas", as is sometimes used to euthanize animals.
Removing it from a burning or burned house might be called "ventilation".