Rapidly remove the dirt indoor air and refill the fresh air. Fresh air is equally exchanged and ventilation is achieved at a step Natural ventilation – design of one fan exhaust air, intake air reply on pressure auto-balance theory Realize ventilation in extremely enclosed space Large air volume, low energy consumption, less noise, easy installation Model Air Volume M3/h Max. Static Pressure Pa Power W Rated Voltage V Rated Frequency Hz Noise dB Air Intake quantity-diameter Outlet Diameter mm Net Weight kg DUT15-33K 370 130 38.5 220 50 27 2-Ø150 2-Ø150 8.5 DUT15-43K 500 150 62.2 220 50 29 2-Ø150 2-Ø150 9.2 DUT20-54K 770 180 98.8 220 50 32 2-Ø200 2-Ø200 15.5 DUT20-54K1 920 210 135 220 50 35 2-Ø200 2-Ø200 16.8