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How to choose a smoke exhaust fan?

Author: BOYEAH  Date: 2019-01-09

How to choose a smoke exhaust fan?


First: According to the size of the kitchen space and the layout of the exhaust hood, the air volume required by the fan is selected.

The calculation method of the exhaust fan is as follows:

1. The overall amount of air, according to the kitchen space, ventilation 40-60 times per hour.

For example, the kitchen has a total area of 160 square meters and a height of 3 meters. The required ventilation is 160X3X60=28800m3/h.

2. According to the windward side of the kitchen exhaust hood (the length of the exhaust hood minus the length of the wall), the wind speed per second is about 0.5 meters.

For example, the kitchen exhaust hood has a circumference of 25 meters, and the length of the wall is 10 meters. The required ventilation is 3600X (25-10)X0.5= 27000m3/h.


Second: Calculate the static pressure required by the fan according to the condition of the pipeline:

1. Determine the cross-sectional area of the duct according to the air volume and wind speed (wind speed of 10-15 m/s). The width and height ratio of the duct should preferably not exceed 2:1 (to save material and reduce wind resistance).

2. Calculate the wind resistance (ie the static pressure required by the fan) according to the wind speed, cross-sectional area of the air duct, elbow, and variable diameter.

3. According to the calculated air volume, static pressure. Choose the right fan.

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