One caveat that I should add is that not all of the ventilators in storage are appropriate for treating patients with COVID. 8,567 of the ventilators in storage are CPAP machines, 22,976 are non-invasive ventilators (usually BiPAP machines), and 32,668 are automatic resuscitators. Still, between the ventilators in hospital storage, those in the SNS, anesthesia machines, and ventilators in the VA and military systems, I estimate that the number of mechanical ventilators that can be used to treat patients with COVID-19 at over 200,000.
The limiting factor in in treating patients with respiratory failure is trained personnel, not mechanical ventilators. While some locations (e.g. NYC and Seattle) may end up having a shortage of mechanical ventilators, the greatest challenge on a national scale will be finding enough providers to manage all of the patients requiring mechanical ventilation. The SCCM report provides some preliminary recommendations on how to address this problem -- those recommendations deserve more attention!
Please comment below if you have additional input, feedback, or other questions!