A large number of ventilators may potentially be required soon, and the Railways-owned Integral Coach Factory (ICF) has made an attempt to “reverse engineer” the machines. Private sector carmakers with no experience in this line too, have joined the task. Ventilators (or respirators) are mechanical devices that help a patient breathe when they are unable to do so on their own. Hospitals have a supply system for gases like oxygen, which are used in ventilators. The ventilator takes the compressed gas (oxygen) and mixes it with other gases (because typically what we breathe is 21% oxygen from the atmosphere). It allows you to artificially push in a certain required amount of oxygen into the patient’s lungs and allows them to deflate.