Almost half of ventilators stockpiled by the United States don’t meet the minimum requirements needed to save the lives of critical COVID-19 patients, reports Reuters.

With the COVID-19 pandemic sweeping across its shores earlier this year, the U.S. government in April announced orders for almost $3 billion of ventilators for a national stockpile, meant to save Americans suffering from severe respiratory problems brought on by the disease.

But of the 140,000 machines added since then by the government to the U.S. Strategic National Stockpile, almost half were basic breathing devices that don’t meet what medical specialists say are the minimum requirements for ventilators needed to treat Acute Respiratory Distress Syndrome, the main cause of death among COVID-19 patients, according to a Reuters review of publicly-available device specifications and interviews with doctors and industry executives.

Read more from Reuters.