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