Anemostat
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An anemostat is a device used to regulate airflow and pressure in a room or system requiring complex airflow patterns. Anemostat is the trademark name of the Anemostat company, however, the company name has become synonymous with the device. The word is a combination of anemometer and thermostat. Anemostats are used in hospitals to stabilize room conditions, and to prevent the spread of airborne pathogens. In laboratories with fume hoods, anemostats help to ensure adequate conditions for optimum ventilation.