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This paper is a theoretical study of controlled ventilation with a respirator. An electric circuit analog of the respiratory system is used with respiratory parameters of the normal adult. Deleterious effects of positive pressure ventilation are considered and related to the model. The effects considered include peak alveolar pressure and its time of occurrence, work, and average alveolar pressure. Different pressure waveforms are used as the driving source for the respirator model. These waveforms are rectangle, ramp, negative ramp, sine, and exponential.