DIDW Fans

DIDW stands for Double Inlet Double Width centrifugal fans. These are a common type of centrifugal fan used when very high air volume is required at moderate pressure.

Product Code MAF
Sizes Varies on Selection
Diameter 300 – 1400 mm
Material of Construction Available in Mild Steel and Stainless Steel
CMH Upto 6,00,000
Pressure Up to 125 mm WC
HP (Motor Power) From 2 to 500 HP

1. What DIDW Means

  • Double Inlet → Air enters from both sides of the impeller.
  • Double Width → The impeller width is twice that of a single-width fan.
  • So essentially it is like two centrifugal fans combined into one impeller, drawing air from both sides.

2. Construction

Main components:

  • Impeller (Double Width)
  • Two inlet cones
  • Fan housing/scroll
  • A shaft running through the center
  • Bearings on both sides
  • Drive (belt drive or direct drive)

3. Typical Applications

  • DIDW fans are widely used in:
  • Air Handling Units (AHU)
  • HVAC systems
  • Evaporative cooling plants
  • Dust collection systems
  • Industrial ventilation
  • Boiler FD fans (some designs)
  • Because they handle large airflow with smooth distribution.

4. Advantages

  • Very high airflow capacity
  • Compact design for large volume
  • Better airflow distribution
  • Lower noise compared to single inlet fans
  • Balanced loading on the shaft