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A plenum is a space, usually an enlarged space in air handler ductwork (forced hot air heating systems). In the plenum the air can be heated, cooled, humidified or dehumidified before being redirected down smaller ducts for the final endusers. It is often the first space through which air, being drawn in through the filters, passes into the system.
They design video games either in whole or in part. A video game designer may design the entire game from scratch, or they may be reponsible for certain aspects of the game, such as graphics, sound, plot, characterisation, human interfaces, and so on. They are also be responsible for designing the algorithms and logic that drive the game, the classes employed by the game, and so on. By the time the design reaches the actual programmers, they simply have to translate the design concept into working machine code. About 80% of the development process is spent purely in design.