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S&P SILENT DUAL 300 autonomous and smart axial fan for the bathroom. It automatically adjusts its performance to the ambient conditions and ventilation requirements via a presence detection sensor and a humidity sensor. SILENT DUAL 300 incorporates an intelligent control algorithm to automatically adjust the settings according to the ambient conditions, without the need for user interaction. This fan learns from its environment (ambient conditions) and operates accordingly.Key Features: – smart automation with motion and humidity sensors – quiet operation with variable speed AC motor – built-in timer and non-return valve – hermal protection for enhanced safety – IP45-rated for durability in humid environments