Are you looking for the right DIDW centrifugal fan? It is very important to understand the principle and advantages of DIDW fans. This article will introduce you to the basic information of DIDW centrifugal fans, hoping to be helpful to you.
What Is a DIDW Centrifugal Fan?
DIDW stands for Double Inlet Double Width, which is a centrifugal fan used in a variety of industrial and HVAC applications. DIDW fans have two inlets and a wider impeller than single inlet fans, allowing them to handle higher airflow rates and pressures with lower noise levels. DIDW fans are also designed to increase efficiency and performance compared to single inlet fans. Langdi Group offers both double inlet backward curved fans and double inlet forward curved fans to suit different application needs.
What Is the Working Principle of DIDW Centrifugal Fan?
The working principle of the DIDW (Double Inlet Double Width) centrifugal fan is the principle of an air moving device that uses a rotating impeller to increase the speed and pressure of the air. The fan has double air inlet design, air enters the impeller from both sides, the air inlet area is larger, and the performance is better. The impeller rotates at high speed within the volute housing, creating airflow by drawing air in the center of the impeller and expelling it around the periphery. This increase in air velocity and pressure causes the air flow to overcome resistance in the ductwork or other air handling equipment.
What Are the Advantages of DIDW Centrifugal Fans over Single-Inlet Fans?
Advantages of DIDW centrifugal fans over single inlet fans include:
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Higher Airflow Rates
DIDW fans have two inlets, which increases their airflow capacity compared to single inlet fans.
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Higher Efficiency
The wider impeller design of the DIDW fan gives it more headroom for performance and efficiency improvements, delivering higher performance regardless of power consumption.
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Higher Pressure Capacity
The DIDW fan's dual-inlet design enables it to handle higher pressures than single-inlet fans, which provide corresponding environmental support.
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lower Noise Level
DIDW fans have a wider impeller design and dual-inlet configuration compared to single-inlet fans. The DIDW fan's dual air inlets and wide blade design help distribute the airflow more evenly, reducing turbulence and noise levels; at the same time, the two inlets of the DIDW fan can be adjusted independently for better airflow balance and reduced turbulence and noise noise.
Which Applications Are DIDW Fans More Suitable For?
According to the large air flow and high pressure industrial applications of DIDW fans, DIDW centrifugal fans are more suitable for some industrial projects with high flow requirements, especially applications that require wide suction ports. For example:
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Air Conditioning Systems: Used to supply and distribute air to cool and humidify large spaces.
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Chimney exhaust: used to discharge toxic gases and exhaust gases through exhaust ducts.
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Oilfield air compression: used to provide air and gas compression.
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Electricity production: used to cool generators and radiators.
| Comparison | DIDW Fan | SISW Fan |
| Full Name | Double Inlet Double Width | Single Inlet Single Width |
| Number of Inlets | 2 (both sides of the impeller) | 1 (one side only) |
| Impeller Width | Wider | Narrower |
| Airflow Capacity | Higher | Lower |
| Static Pressure | Higher | Moderate |
| Energy Efficiency | Higher (balanced airflow load) | Slightly lower |
| Noise Level | Lower (more balanced airflow) | Relatively higher |
| Axial Thrust | Minimal (forces cancel each other out) | Higher (one-sided airflow) |
| Size & Footprint | Larger | More compact |
| Installation Space | Requires more space | Suitable for tight spaces |
| Maintenance | Slightly more complex | Simpler |
| Cost | Higher | Lower |
| Typical Applications | Large HVAC systems, AHUs, industrial ventilation, power plants | Small-to-medium HVAC, residential ventilation, OEM equipment |
For a more detailed comparison, read our full guide: DIDW Centrifugal Fan VS SISW Centrifugal Fan
Frequently Asked Questions (FAQs) about DIDW Centrifugal Fans
Q1: What does DIDW stand for in fans?
DIDW stands for Double Inlet Double Width. It refers to a centrifugal fan design that features two air inlets (one on each side of the impeller) and a wider impeller compared to standard single-inlet fans, allowing for higher airflow and better performance.
Q2: What is the difference between a DIDW fan and a SISW fan?
The main difference is the number of inlets. A DIDW fan draws air from both sides of the impeller, offering higher airflow capacity and better load balance. A SISW fan draws air from only one side, making it more compact and suitable for applications with limited installation space or lower airflow requirements.
Q3: Is a DIDW centrifugal fan more efficient than a SISW fan?
Generally, yes. Because a DIDW fan distributes the airflow load across two inlets, it achieves higher volumetric efficiency and reduces axial thrust on the shaft bearings, resulting in lower energy consumption per unit of airflow delivered — particularly in high-volume applications.
Q4: What are the typical applications of DIDW centrifugal fans?
DIDW centrifugal fans are widely used in HVAC systems, industrial ventilation, air handling units (AHUs), clean rooms, data centers, chemical plants, power generation cooling, and any application requiring high airflow rates or balanced pressure distribution.
Q5: How long does a DIDW centrifugal fan last?
With proper installation and regular maintenance, a quality DIDW centrifugal fan can last 10 to 20 years or more. Factors affecting lifespan include operating temperature, dust levels, bearing quality, and whether the fan is operated within its designed performance range.
The Best DIDW Fans to Buy
Langdi Group is a leading manufacturer of centrifugal fans in China, providing various types of high-performance centrifugal fans including DIDW, SISW, etc. Welcome to contact us for the latest quotation!
Read More:
DIDW Centrifugal Fan Vs SISW Centrifugal Fan
