. The main control parameters for selecting exhaust fans are working temperature, air volume, pressure, efficiency, noise, motor power, speed, and shaft power.
2. Exhaust fans should operate normally for a long time under conditions where the medium temperature does not exceed 85°C.
3. Exhaust ventilation fans must be reliable: capable of continuous operation for 30 minutes at a medium temperature of 280℃, and still operate normally after the medium temperature cools down to ambient temperature.
4. At the rated speed, within the operating area, the actual pressure curve of the ventilator should match the curve specified in the instructions.
Axial flow exhaust fans will have a pressure value deviation of ±5% under the specified flow rate.
b) Centrifugal exhaust fans shall have a pressure deviation of ±5% at the specified flow rate.
5. The A-weighted noise level of the exhaust ventilation fan at the operating conditions specified in the instruction manual shall comply with the requirements of JB/T8690-1998.
6. Exhaust fans can be either standard steel centrifugal ventilators or axial flow ventilators for exhaust. The specifications of the 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 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 exhaust zone).
7. The exhaust fan air volume should be increased by an excess of at least 10% to 20% of the required air volume value.
8. The wind pressure value of smoke-proof pressure ventilators should be calculated based on the disadvantageous loop of the smoke exhaust system, and reliably maintained at a residual pressure of 40-50Pa in the smoke-proof staircase. The residual pressure inside the antechamber, combined antechamber, fire elevator antechamber, and refuge floor should be 25-30Pa.
9. Fire-extraction and smoke exhaust fans should comply with the current standard JB/T10281-2001 "Technical Conditions for Fire-extraction and Smoke Exhaust Ventilation Fans."
10. The exhaust fan of the exhaust system should ideally be a single-head setup. The location of the exhaust fan should be on the same level or above the exhaust area.
