Filters may burn or even explode because of sparks within exhaust ducts. GreCon Spark Extinguishing Systems are designed to prevent this. They detect small sparks within the ducts and extinguish them in a split second. Spark sensors detect the infrared radiation of glowing particles. Immediately, a dense water mist spray which extinguishes passing sparks is created in a specified distance downstream from the spark sensors. The production process can continue without interruption during the whole procedure.