Main parameters: 1, exhaust air volume. Air volume refers to the exhaust air volume per unit time of the range hood under the condition of zero static pressure. The national index value is greater than or equal to 7m3/min. Generally speaking, the greater the air volume, the more quickly and timely a large number of kitchen fumes can be sucked out and discharged. When other indicators are good, try to choose a range hood with large air volume. In addition, the air volume is not as large as you want to design, and it is restricted by many factors. At present, the air volume of range hoods on the market can reach 14m3/min, which is very good. 2. Wind pressure. Wind pressure refers to the static pressure when the air volume of the range hood is 7m3/min. The national index value is greater than or equal to 80Pa. Wind pressure is also an important index to measure the performance of range hood. The greater the wind pressure, the stronger the anti-suction ability of the range hood; If the smoke exhaust pipe is long or connected to the public flue, the smoke exhaust pressure loss is large, and a large wind pressure is needed to ensure smoke exhaust. Therefore, when other indicators are good, the greater the wind pressure value, the better. Similarly, wind pressure, like air volume, is also restricted by many factors. 3. Noise. Noise is also an important technical index to measure the performance of range hood. Refers to the A sound power level measured by the specified method when the range hood runs at the highest speed under the rated voltage and rated frequency. The index value stipulated by the state shall not exceed 74dB. 4. Motor input power. The model of range hood is generally specified as CXW-□-□, in which the number in the first "□" indicates the input power of the main motor. The input power of range hood is not as big as possible, because the purpose of increasing power is to increase air volume and air pressure. If the air volume and air pressure are not increased, no matter how high the power is, it will be useless. Second, the greater the power, the greater the noise and the more power consumption.