Well we'd need to get the government to pay them to ramp up production, otherwise they might go bankrupt producing more ventilators than end up being needed. Paying for "insurance" in the form of extra ventilators should probably be done by the government, not by a corporation.

I don't think there's a big risk they'll have trouble selling ventilators

If you Google "buy ICU ventilator" there are tons of sources purportedly selling them, no idea which ones are legit though.

Which manufacturer is this? What country is it in?

Why do you think they aren't?