Key points for selecting smoke exhaust fans

smoke exhaust fanKey points for selection

1. smoke exhaust fanThe main control parameters selected are operating temperature, air volume, total pressure, efficiency, noise, motor power, speed, and shaft power.

　　2. smoke exhaust fanIt should be able to operate normally for a long time under the condition that the medium temperature is not higher than 85 ℃.

　　3. smoke exhaust fanIt should be ensured that it can work continuously for 30 minutes when the temperature of the conveying medium is 280 ℃, and can continue to operate normally when the medium temperature cools down to ambient temperature.

At rated speed, the measured pressure curve of the ventilation fan in the working area should meet the following requirements compared to the curve given in the manual:

a) Axial flow typesmoke exhaust fanAt the specified flow rate, the corresponding pressure deviation is ± 5%.

b) Centrifugal typesmoke exhaust fanAt the specified flow rate, the corresponding pressure deviation is ± 5%

　　5. smoke exhaust fanThe limit of A-level noise under the given operating conditions in the manual shall comply with the provisions of JB/T8690-1998.

　　6.smoke exhaust fanOrdinary steel centrifugal fans or smoke exhaust axial fans can be used. The specifications of the smoke exhaust fan shall comply with the provisions of the "Code for Fire Protection Design of High rise Civil Buildings".smoke exhaust fanThe minimum air volume is 7200m/h, and the maximum air volume should not exceed 60000m/h (referring to the maximum air volume of a smoke exhaust zone).

　　7. smoke exhaust fanThe air volume should increase by no less than 10% to 20% according to the required air volume value.

8. The air pressure value of the smoke prevention and pressurization ventilation fan should be calculated according to the most unfavorable loop of the smoke exhaust system, and the residual pressure value in the smoke prevention staircase should be ensured to be 40-50 Pa. The residual pressure value in the front room, shared front room, fire elevator front room, refuge floor, etc. should be 25-30 Pa.

9. Firefightingsmoke exhaust fanIt should comply with the current standard JB/T10281-2001 "Technical Conditions for Fire Exhaust Ventilation Fans".

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