Ensure smooth ventilation. The outlet pipe diameter of the roof exhaust fan should be as large as possible, not smaller. Install insect screens at the outlet to prevent flying insects from entering. During snow and ice conditions, operate the fan frequently to prevent snow and ice from clogging the outlet.
Roof Exhaust Fan Selection Considerations:
1. When selecting a roof exhaust fan, pay attention to the parameters, mainly fan type, material, air volume, total pressure, efficiency, noise level, and motor power.
2. When selecting, consider the matching relationship between the duct network resistance characteristics and the fan characteristics to ensure stable operation. The fan should operate near its highest efficiency point, with its operating point located to the right of the peak total pressure point on the performance curve.
3. When selecting a roof exhaust fan, choose one suitable for the physical and chemical properties of the gas being transported.
4. For ventilation systems requiring noise reduction, prioritize high-efficiency fans with low impeller circumferential speeds, ensuring they operate near their peak efficiency.
5. When selecting a fan, consider leakage losses in the piping system, calculation errors, and negative deviations in the actual airflow and pressure of the roof exhaust fan. Generally, a safety factor within the range of 1.05–1.1 m³/h airflow and 1.10–1.15 m³/h pressure is optimal.
