Mixed Flow Fans: The Ultimate Guide to Efficiency, Applications & Selection (2025)
Discover how mixed flow fans combine axial and centrifugal benefits for high-pressure, low-noise airflow. Learn key applications, design advantages, and how to choose the best model for your needs.
1. What is a Mixed Flow Fan?
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A mixed flow fan is a hybrid ventilation device that merges the high airflow of axial fans with the pressure generation of centrifugal fans. Its unique blade design allows air to flow both axially and radially, making it ideal for applications requiring:
✔ Medium-to-high static pressure (50–500 Pa)
✔ Compact space efficiency
✔ Lower noise levels vs. pure centrifugal fans
2. Key Advantages of Mixed Flow Fans
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Feature Mixed Flow Fan Axial Fan Centrifugal Fan
Pressure Medium-High Low High
Efficiency 65–80% 40–60% 70–85%
Noise Moderate Low High
Space Compact Bulky Large
Why choose mixed flow?
Energy savings: 20–30% more efficient than axial fans in ducted systems.
Versatility: Handles dust/moisture better than centrifugal fans.
Installation flexibility: Fits tight spaces (e.g., HVAC, industrial tunnels).
3. Top Applications of Mixed Flow Fans
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HVAC Systems
Air handling units (AHUs) in commercial buildings.
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Industrial Ventilation
Fume extraction, welding exhausts.
Tunnel & Underground Ventilation
Fire safety compliance (mention EN 12101-3 standards).
Agricultural Drying
Grain drying, greenhouse airflow.
4. How to Select the Right Mixed Flow Fan
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Step 1: Calculate Required Airflow & Pressure
Use the formula: CFM = (Room Volume × Air Changes/Hour) / 60.
Step 2: Evaluate Environmental Conditions
Corrosive environments → Stainless steel housing.
High temperatures → Heat-resistant blades (e.g., aluminum alloy).
Step 3: Compare Motor Types
EC Motors: 30% energy savings, variable speed.
AC Motors: Lower upfront cost.
5. Maintenance Tips for Longevity
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Monthly: Check for dust buildup on blades.
Annual: Lubricate bearings (use ISO VG 32 oil).
Troubleshooting:
Vibration issues → Rebalance impeller.
Reduced airflow → Clean filters/ducts.
6. FAQs About Mixed Flow Fans
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Q: Can mixed flow fans replace centrifugal fans?
A: Yes, for medium-pressure apps (e.g., HVAC), but not for ultra-high pressure (>1000 Pa).
Q: Are mixed flow fans waterproof?
A: Only IP54+ rated models (check specifications).
Q: What’s the average lifespan?
A: 8–12 years with proper maintenance.
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