How to determine the air volume of a kitchen fan

The diameter of the outer cylinder is only 21 cm, so the diameter of the exhaust fan inside is not so large, which can only mean that the exhaust fan is too small, try a larger one.

Knowing the air volume, the cross-sectional size of the duct can be determined according to the economic wind speed.

7 square meters, assuming a height of 4 meters, then the volume of the kitchen is 28m, the general kitchen because of the smoke is relatively large, so it is best to change the air per hour to reach 80 times, then the kitchen requires 2240m h of air volume, so I recommend that you use the number, impeller diameter 280mm, outer diameter 330mm, power 250W, air volume 3203m h, wind pressure 232Pa, this fan wind pressure is high, can suck out the fumes, of course, for the sake of insurance, you can choose a larger one, That is, the number.

The number of ventilation in the kitchen is generally about 60 times, that is, the space volume of the kitchen is multiplied by 60 for the total exhaust volume per hour (the kitchen height of 100 square meters is calculated according to meters, and the exhaust smoke volume per hour is 100 cubic meters), and the wind speed of the air duct at the hood interface is required to be between 7 and 8m s, and there will be noise when it is large

I have done three cabinet design, I feel that it should be from the standard, some experience for reference: 1. The height of the operating table: the housewife stands and touches the bottom of the washing basin, and the paint bar is quasi-50mm, 2. The height of the hanging cabinet from the surface is considered to affect the operation of the hanging cabinet, and the bottom distance of the hanging cabinet should be 50mm in 1450mm 3. The net space between the bottom of the hanging cabinet and the operating table is 500mm, and the distance between the range hood and the stove is 00-00mm. Fourth, the height of the high vertical cabinet mainly considers the overall kitchen and the top of the wall cabinet.