Description
EVO HUMMER EXHAUST FAN
- The Shutter Opening Mechanism
The primary and most defining difference between the two fans lies in how their protective shutters (louvers) open and close.
Hummer (Hammer) Exhaust Fan
The Hummer fan utilizes a mechanical, gravity-based system to operate its shutters.
- Mechanism: It features a heavy “hammer” or swing-drop weight mechanism attached to the shutter linkage. When the fan motor starts and the blades begin to spin, the centrifugal force or the airflow itself pushes against the mechanism, lifting the heavy hammer weight and forcing the shutters open.
- Closing: When the fan stops, the weight of the hammer pulls the linkage down, relying on gravity to snap the shutters tightly closed.
- Characteristics: This is a simpler, purely mechanical system that doesn’t require separate electrical actuators for the shutters.
- Airflow and Performance
The difference in the shutter mechanism directly impacts the aerodynamic efficiency and overall air volume (CFM/CMH) the fans can move.
- Hummer Fan: Because the shutters are held open partially by the force of the airflow pushing against them (and the hammer weight), they may not always open to a full 90-degree angle, especially if there is wind resistance outside or if the fan is running at lower speeds. This slight angle creates drag, slightly reducing the overall air volume compared to a push-pull fan of the same size and motor power.
- Durability and Maintenance
Both fans are designed for harsh environments, but their mechanisms wear differently.
- Hummer Fan: The hammer mechanism is robust and simple. However, the constant swinging and dropping of the heavy weight can cause wear on the linkage pins and joints over time. The shutters might also flutter if the airflow is inconsistent.
Summary Comparison Table
| Feature | Hummer (Hammer) Fan | Push-Pull Fan |
| Shutter Mechanism | Gravity/Airflow driven heavy weight | Centrifugal mechanical linkage |
| Shutter Opening Angle | May vary, often less than 90° | Fully open (90°) and locked |
| Air Volume (Same Motor) | Standard | Larger (due to less air resistance) 20-30% higher |
| Airflow Efficiency | Good | Excellent |
| Shutter Flutter | Possible in strong winds | Minimal to none |
| Initial Cost | Lower (More economical) | Higher |
| Best For | Budget-conscious projects, standard ventilation | High-efficiency needs, maximum airflow requirements |
| installation | easy | easy |
Performance Specifications
| Model | Drive | Blade Diameter (mm) | Blade Rotational Speed (rpm) | Motor Rotational Speed (rpm) | Air Flow (m³/h) | Total Pressure (Pa) | Noise dB | Input Power (W) | Power Parameter | Height (mm) | Width (mm) | Thickness (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EVO-1530 (55″) | Belt | 1400 | 425 | 1400 | 55000 | 60 | ≤59 | 1500 | 380V/50Hz | 1530 | 1530 | 400 |
| EVO-1380 (50″) | Belt | 1250 | 458 | 1400 | 46000 | 57 | ≤60 | 1100 | 380V/50Hz | 1380 | 1380 | 400 |
| EVO-1220 (43″) | Belt | 1100 | 458 | 1400 | 41000 | 57 | ≤62 | 1100 | 380V/50Hz | 1220 | 1220 | 400 |
| EVO-1100 (40″) | Belt | 1000 | 470 | 1400 | 35000 | 70 | ≤64 | 750 | 380V/50Hz | 1100 | 1100 | 400 |
| EVO-1000 (36″) | Belt | 900 | 470 | 1400 | 30000 | 70 | ≤64 | 750 | 380V/50Hz | 1000 | 1000 | 400 |
| EVO-900 (30″) | Belt | 750 | 560 | 1400 | 22000 | 73 | ≤70 | 550 | 380V/50Hz | 900 | 900 | 400 |
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