   For example, a person running is an example of kinetic energy  because they are in â¦ motion. Potential energy is the other form of  energy, which is the energy an object has because of its position,  tension, pressure, or chemical formulation.
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Return Plenum. Forced-air systems also have return ducts that connect to the HVAC equipment through an air-collection box known as a return plenum. As freshly conditioned air is blown out of the room supply ducts, âusedâ air from the rooms is sucked into the return ducts.he HVAC equipment has a blower that forces heated or cooled air into the supply plenum and from the plenum into the rooms through the supply duct system. Air-cleaning filters may be located in the supply plenum.