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.
Natural ventilation is the ventilation of a building without the aid of fans or other mechanical systems. Historically all buildings were ventilated naturally with the help of windows and skylights. Natural ventilation use the pressure difference or temperature difference to allow the flow of air through the building.t is the movement of air from one space to other as well as supply of fresh air into the air conditioned space. Mechanical ventilation assists in controlling the humidity, contaminants, air borne particles, and general air quality.