https://techcrunch.com/2020/04/05/tesla-shows-how-its-building-ventilators-with-car-parts/

Tesla is among a group of automakers retooling facilities to build ventilators for the Covid-19 crisis. In the following video, the company provides a behind-the-scene look at its ventilator design process.

Like Ford and General Motors, Tesla engineers are building its vent with parts for its vehicles. The reason is simple: car parts are available. Automotive companies obsessively stage parts for final assemble. Without doing so, having a shortage on, say, door handles can shut down a production line. In this thought, Tesla engineers say in this video they are trying to use as many car parts as possible.