BLD ceiling room ventilation machine number: 120 # -400 # air volume: 120-1200m3 / h Pressure: 100-250Pa features: elegant appearance, low noise, high efficiency and practical, vibration small, long life, the use of plastic materials, installation and maintenance is very easy to use: meeting rooms, restaurant, reception room, bathroom, shower, and various other places no dirty window room air, moisture, smoke, dust play a good ventilation effect