Definition of "ventilation system" []

• A mechanical system in a building that provides fresh air (noun)

WordNet. Princeton University. 2010.

• "From there it was a short jump across a twenty-meter drop to the top of the conjoined air recycling and composting ventilation system that served the sprawling apartment complex below."
• "Like everything else on the ship, the Barsoom’s ventilation system is overbuilt and redundant."
• "The local ventilation system was still functioning or they would have already suffocated, but if vital fans or ducts were destroyed, the air could turn unbreathable rapidly."