The smoke exhaust system in the kitchen mainly consists of a smoke hood, smoke exhaust pipes, an oil fume purifier, a smoke exhaust fan (including a silencer), and an overall kitchen air supplement device. The type and operation mode of the oil fume purifier can be selected according to the actual situation. Before installing the oil fume purifier, it is necessary to first calculate the actual operating parameters of each part of the smoke exhaust system, including operating resistance and exhaust air volume. If it is a new project, the design should fully consider the impact of installing an oil fume purifier on the exhaust system; If it is a renovation project, the exhaust system needs to be recalculated when installing an oil fume purifier. If necessary, the smoke hood, exhaust duct, and overall kitchen air supply device need to be modified and the exhaust fan replaced.
Secondly, the determination of kitchen oil fume exhaust volume (calculation of exhaust fan air volume)
In order to ensure the purification effect, the exhaust air volume of the smoke exhaust fan is strictly calculated according to the suction wind speed of the exhaust hood in actual design, and the suction speed of the hood opening is usually not less than 0.5m/s. The Z-small exhaust volume is commonly calculated using the following formula: L=1000PH, where L - exhaust volume of the exhaust hood, m3/h; P - The perimeter length of the hood (excluding the edge against the wall), m; H - distance from the hood to the stove surface, in meters. Let me emphasize: smoke exhaust fan
There are three types of commonly used smoke exhaust fans: axial smoke exhaust fans, fire smoke exhaust box fans, and fire smoke exhaust centrifugal fans.
(1) Smoke exhaust axial flow fans were widely used in the past, but due to their low total pressure, they were rarely used after installing oil fume purifiers.
(2) The fire smoke exhaust box type fan has a moderate total pressure, adjustable air volume, and low noise. It is often used in kitchen smoke exhaust systems where the distance between the smoke hood and the oil fume discharge outlet is moderate
(3) The total pressure and air volume of the fire exhaust centrifugal fan can be adjusted, but due to the high noise, noise reduction treatment is often required. When the kitchen is located at the bottom of a building, its exhaust fan should be placed on the roof to reduce indoor noise pollution. At the same time, the exhaust duct is in a negative pressure state to avoid odor leakage. When placing fans on the roof, centrifugal fans are generally chosen
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