There are simply fans (usually containing a means of heat in northern climes) which introduce outside air into a space. Typically, to compensate for air lost due to exhaust in areas such as kitchens, locker rooms, manufacturing areas etc.
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The temperature of the air is a measure of the degree of molecular movement of all the Nitrogen and Oxygen molecules that largely make up air. Technically, it is determined by getting the average speed of a body's molecules.
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