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Pneumatic Thermostats
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Pneumatic thermostats respond to changes in temperature by increasing or decreasing the air pressure in a series of air-filled tubes. The change in pressure signals controllers or powers devices like dampers or valve actuators directly. Pneumatic thermostats are most often installed as replacements in older constructions with existing pneumatic systems, including schools, hospitals, and commercial buildings. They are not suitable for newer constructions without a supporting pneumatic system in place.