About ramping up production: My experience is, that ramping up some parts of production is not hard. The PnP machine easily can handle larger quantities, more shifts. Same goes for injection moulding. And the manual parts of assembly can be augmented by more people, or smarter organisation. This is usually not the hard part.
What I've seen is that the bottleneck is usually the testing of the device. They very likely functionally test each and every ventillator before shipping it. And the test bench of this is going to be the bottleneck. For example, if is possible that they have an artificial lung, government approved, calibrated, specifically designed to test ventilators. And then you need to connect your device to this, and do a x hour burn in test, to avoid early failures, and to prove your device is assembled correctly. Could be two hours, could be 24 hours, who knows? The test length probably was designed to reduce the chance of early failure to the ppm level. And that lung with all the sensors and equipment connected to it is very time consuming to put together, very expensive, and requires exotic parts, that you need to order yourself. And when you order them, they have a lead time. And very expensive. So if you want to just 2x or 3x your throughput, you might just pull in more shifts.
But you want x10? Invest hundreds of thousands in equipment, that will just sit there afterwards? Hire people in the middle of the pandemic for a new job to work at night? What if you just run out of factory floor space, because all these require space. Pull up a building next to it? Or assemble medical equipment in tents?