This video shows why you cant always trust all information on the internet, as well as shows the basics of torque wrenches and a few oddball calculations you might run across when building custom things.
Underground mine ventilation. Underground mine ventilation provides a flow of air to the underground workings of a mine of sufficient volume to dilute and remove dust and noxious gases (typically NOx, SO2, methane, CO2 and CO) and to regulate temperature.
Mechanical ventilation. Assisted ventilation could be defined as the movement of gas into and out of lungs by an external source connected directly to the patient. The external source could be the resuscitation bag, continuous distending pressure device or a mechanical ventilator.