... mushoroom farms, chess room, dining, shopping malls and so on. 2. Ultra-low running quiet performance, concection core be used, low ... , slom and lightweight design. 3. DC brushless unit noise reduction 2-5dB than ordinary models, quieter and room quieter, which the ... life, you can enjoy a quiet and comfortable living envcvironment. 4. High reliability of the control circuit. High efficiency of heat ...