Here's a primer on how oxygen concentrators work and when they would be required, if at all:What is oxygen therapy? To understand how oxygen concentrators work, one first needs to understand how oxygen is used in the medical treatment of Covid-19. This treatment uses an external supply of medical oxygen to artificially enhance our oxygen levels to clinically acceptable levels. In a way, these oxygen concentrators function in a similar manner as oxygen tanks or cylinders do, supplying oxygen to the body with the use of a cannula, oxygen masks, or nasal tubes. The only difference is -- while cylinders and canisters need to be refilled, oxygen concentrators can work 24x7.

Source: Hindustan Times May 01, 2021 11:37 UTC