Duct Fan

A smoke exhaust fan is a mechanical device that swiftly removes unpleasant odors, high temperatures, and油烟 gases produced during the food processing in a kitchen. The machine features excellent high-temperature resistance and high efficiency.

Selection Key Points:

1.

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

2.

The exhaust ventilation 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 is 280°C, and it should also operate normally continuously once the medium temperature cools down to ambient temperature.

4.

At the rated speed, within the operating area, the actual pressure curve of the fan should comply with the following specifications as given in the manual:

5.

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

6.

Centrifugal exhaust ventilation fans have a pressure deviation of ±5% at 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 fan can be a standard steel centrifugal fan or a specialized smoke exhaust axial flow fan. The specifications of the smoke exhaust fan are in accordance with the regulations in the "Code for Fire Prevention Design of High-rise Civil Buildings." The minimum air volume of the smoke exhaust fan 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 not less than 10% to 20% of the required air volume value.

10.

The wind pressure value of smoke control pressurized ventilators should be calculated based on the adverse loop of the smoke exhaust system, ensuring a residual pressure of 40-50 Pa within the smoke control stairwell. The residual pressure within the antechamber, combined antechamber, fire elevator antechamber, and refuge floor should be 25-30 Pa.

11.

Fire smoke exhaust fans should comply with the current standard JB/T10281-2001 "Technical Conditions for Fire Smoke Exhaust and Ventilation Fans."

12.

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