Explosion proof damper actuator

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Explosion proof | FAQ Schischek GmbH Explosionproof

Do I need an explosion proof damper actuator?
Question: Do I need an explosion proof damper actuator if the medium in the duct is explosive but the actuator is mounted on the damper shaft out of the airflow? Answer: Yes, you do require an Ex actuator. There are various points on the duct (flange connections, temp/pressure sensor duct probes etc.) where some leakage from the duct may occur. If this happens, an Ex area zone 1, 2, 21 or 22 will be outside the duct. There is the potential for explosion and only if all equipment outside the duct is Ex safety can be guaranteed. CAUTION! The same applies to sensors, switching contacts, monitors, valve actuators etc.
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