There was a crisis at the zoo. A respiratory virus was being spread from one large animal to the other and unless medicine was dispensed quickly, there was the possibility that all of them would die.
The problem was that nobody wanted to get into the cages to administer the dosage because they were afraid they would be mauled in the process. A meeting was called and someone came up with the idea that they could vaporize the medicine and send it through the air conditioning ducts. The animals could inhale the medication and nobody would be put in physical jeopardy. And it worked!
The procedure was thereafter forever known as "medical air for the cage-ed".