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The circuit we have examined is probably the most common application of pneumatic comfort controls. It is used in "four-pipe" hot water / chilled water fan-coil units. When it is cold, the hot water flows. When it is hot, the chill water flows. When the thermostat is satisfied, no water flows and the fan simply ventilates the space. Safe, silent, precise and durable, pneumatic comfort control is a proven workhorse!