A smoke exhaust fan is a mechanical device that quickly removes odors, high temperatures, and smoke gases produced during the food processing in a kitchen. The machine is characterized by its excellent high-temperature resistance and high efficiency.

Key Selection Points:

1.

The main control parameters for selecting exhaust fans include operating temperature, airflow, total pressure, efficiency, noise, motor power, speed, and shaft power.

2.

The exhaust fan should operate normally for a long period under conditions where the medium temperature does not exceed 85°C.

3.

The exhaust ventilation fan should ensure: continuous operation for 30 minutes when the medium temperature reaches 280°C, and continue to operate normally once the medium temperature cools down to the ambient temperature.

4.

At the rated speed, within the working area, the measured pressure curve of the fan should conform to the specifications as given in the manual:

5.

Axial flow exhaust ventilation fans have a pressure value deviation of ±5% under the specified flow rate.

6.

Centrifugal exhaust fans will have a pressure deviation of ±5% under the specified flow rate.

7.

The noise level at the operating point specified in the instruction manual for the exhaust ventilation fan should comply with the requirements of JB/T8690-1998.

8.

The smoke exhaust fans can be either general steel centrifugal fans or specialized smoke axial flow fans. The specifications of the smoke exhaust fans shall comply with the regulations in the "Code for Fire Prevention Design of High-rise Civil Buildings." The minimum air volume of the smoke exhaust fans is 7200 m³/h, and the maximum air volume should not exceed 60,000 m³/h (referring to the maximum air volume of a single smoke exhaust zone).

9.

The exhaust fan air volume should be increased by an excess of at least 10% to 20% of the required volume.

10.

The wind pressure value of smoke-proof pressure ventilators should be calculated based on the unfavorable loop of the smoke extraction system, ensuring a residual pressure of 40-50 Pa within the smoke-proof staircase. The residual pressure in the anteroom, combined anteroom, fire elevator anteroom, and refuge floor should be 25-30 Pa.

11.

The fire exhaust fan shall comply with the current standard JB/T10281-2001 "Technical Conditions for Fire Exhaust and Ventilation Fans."

12.

The exhaust fan of the smoke extraction system should be separately installed. The location of the exhaust fan should be on the same floor or above the smoke extraction area.