4000m³h dust removal induced draft fans

This article's table of contents introduction:

1. Key System Parameters (You need to specify these)
2. Fan Type Recommendations for 4000 m³/h Dust Removal
3. Sample Technical Specification (Medium Pressure)
4. Motor & Drive Considerations
5. Selection Checklist for Your Application
6. Where to Look for Suppliers
7. Summary Recommendation

To address a request for 4000 m³/h dust removal induced draft fans, we need to clarify the application and the specific engineering parameters. "4000 m³/h" (cubic meters per hour) is a relatively small flow rate for industrial dust collection but is common for workshop units, welding fume extractors, or small process ventilation.

Here is a comprehensive breakdown of what you need to know to select, specify, or purchase a fan for this duty.

Key System Parameters (You need to specify these)

Just saying "4000 m³/h" is not enough to buy a fan. The most critical missing parameter is Static Pressure (Pa or mmH₂O) .

• Low Pressure (500 - 1500 Pa / 50 - 150 mmH₂O): Short duct runs, simple hoods, buffer bins.
• Medium Pressure (1500 - 3000 Pa): Long duct runs, small cyclones, baghouse filters (fabric).
• High Pressure (3000 - 5000 Pa): High-efficiency cartridge filters, Venturi scrubbers, dense phase pneumatic conveying.

Other Critical Data:

• Air Temperature: Ambient? Hot exhaust from a furnace?
• Dust Type: Dry (cement, wood, grain) vs. sticky (oil mist, paint) vs. explosive (metal, coal, grain).
• Hazardous Location: Is the area ATEX / Class I Div 2 rated?
• Motor Voltage: 380V / 400V / 690V / 3-Phase? 50Hz or 60Hz?

Fan Type Recommendations for 4000 m³/h Dust Removal

At this flow rate, you have three main fan types, depending on the pressure required.

A. Backward Curved (BC) / Backward Inclined (BI) Fans

• Best for: High efficiency, low to medium pressure, clean to moderately dusty air (dust < 50 mg/m³).
• Pros: Most energy-efficient (up to 85% efficiency), non-overloading power curve.
• Cons: Impeller is narrower; can clog with sticky or fibrous dust.
• Typical Model: A 9-19 or 9-26 series (Chinese standard) or equivalent (e.g., RTE, BPH).
• Application: Central baghouse systems with pre-filter, clean side of a filter.

B. Radial / Paddle Wheel Fans (Radial Blade)

• Best for: High pressure, heavy dust loads, sticky or abrasive dust.
• Pros: Very robust, self-cleaning (flat blades), handles high temperatures.
• Cons: Lowest efficiency (~50-65%), high noise, power consumption increases with flow (overloading risk).
• Typical Model: A “Y5-47” series or “C6-48” series.
• Application: Directly in the dirty gas stream before a baghouse (primary dust collector).

C. Inline / Mixed Flow Fans (IPX / Tubeaxial)

• Best for: Low pressure, simple exhaust (e.g., workshop smoke extraction).
• Pros: Compact, easy to install in ductwork.
• Cons: Very low pressure capability (max ~500 Pa).
• Application: Not suitable for traditional dust collectors unless the pressure drop is very low.

Sample Technical Specification (Medium Pressure)

Assuming this is for a generic small baghouse dust collector with a pressure drop of ~2500 Pa:

Important: If the dust is heavy, abrasive, or sticky, change the fan type to a Radial Blade (Paddle Wheel) . In that case, the motor power would likely be higher (e.g., 7.5 kW to 11 kW) due to lower efficiency, and the speed might be lower (1450 RPM, 4-pole) with a larger impeller.

Motor & Drive Considerations

• Motor Enclosure: TEFC (Totally Enclosed Fan Cooled) is standard. For explosive dust (e.g., aluminum, magnesium, coal), you must use an Explosion-Proof (Ex d / Ex nA) motor.
• Drive Type: Direct Drive is preferred for reliability and lower maintenance. Belt Drive (with sheaves and V-belts) gives you the flexibility to adjust speed (and thus flow/pressure) but requires more maintenance.
• Variable Frequency Drive (VFD): Highly recommended for this size. It allows you to trim the flow precisely to 4000 m³/h, reduce noise, save energy, and soft-start the motor.

Selection Checklist for Your Application

Where to Look for Suppliers

• Standard Industrial Fan Manufacturers:
  • China: Shangfan, Yilong, CDD, or local fan OEMs.
  • International: Cincinnati Fan (USA), Howden (UK), Greenheck (USA), Systemair (EU), Ventmeca (Italy) – but 4000 m³/h is very small for some large OEMs.
• Dust Collection Specialists: Many dust collector manufacturers (e.g., Camfil, Donaldson Torit, UAS, or Chinese equivalents) sell the complete system, including the fan.

Summary Recommendation

If you are building a simple, clean-air exhaust:

• Fan: Backward Inclined (9-19 series), 5.5 kW, 2900 RPM.
• Control: VFD for flow control.

If you are handling heavy, abrasive, or sticky dust (e.g., from a shot blast, grinder, or woodworking):

• Fan: Radial Paddle Wheel (C6-48 series or custom), 7.5 kW, VFD.
• Accessory: Inlet box, access door, drain plug.

To get a final quotation, you MUST provide:

1. Flow Rate: 4000 m³/h (confirmed).
2. Static Pressure: _ Pa.
3. Dust Type: _ .
4. Temperature: _ °C.
5. Voltage/Frequency: 380V / 50Hz (or your local standard).