Centrifugal fans play a vital role in industrial ventilation, HVAC systems, and numerous air-handling applications. At Perkins Blowers, a leading centrifugal fans manufacturer in India, we specialize in designing and manufacturing high-quality centrifugal fans tailored for specific industrial needs. Among the various configurations available, SISW (Single Inlet Single Width) and DIDW (Double Inlet Double Width) centrifugal fans are two commonly used types. While both serve the primary function of moving air efficiently, they differ significantly in design, performance, and application. Understanding these differences is essential when selecting the right fan for your operation.
SISW centrifugal fans are designed with a single air inlet and a single-width impeller. This means they draw air from one side only, making them more compact and suitable for installations where space is limited. They are capable of producing higher static pressure, making them ideal for high-resistance systems like ducted airflows, dust collection systems, industrial ovens, and boiler combustion air supplies. Because they pull air from one direction and discharge it perpendicularly, they are often preferred for focused airflow needs or processes where precise air handling is necessary.
On the other hand, DIDW centrifugal fans feature a double inlet and double-width impeller, allowing them to draw air symmetrically from both sides. This dual suction design enables them to move a significantly larger volume of air with relatively lower pressure. DIDW fans are widely used in large-scale ventilation systems, central air handling units (AHUs), HVAC systems, cleanrooms, and tunnel ventilation. Their balanced construction also helps reduce vibrations and operational noise, making them more efficient and quieter compared to SISW fans in high-volume airflow environments.
From a construction standpoint, SISW fans are simpler and more compact, making them easier to install and maintain in space-constrained environments. They are best suited for localized or individual equipment ventilation where high pressure is required. Conversely, DIDW fans, due to their broader design and dual inlet, occupy more space but offer superior airflow efficiency. They are ideal for centralized ventilation systems where high volume air movement is required with minimal energy consumption.
In terms of performance, SISW fans deliver higher pressure but at a lower airflow volume. This makes them more effective in high-resistance applications such as pneumatic conveying or combustion air supply. DIDW fans, with their symmetrical air intake and larger impellers, are engineered for high airflow capacities, making them the preferred choice for large commercial buildings, industrial ventilation, and air circulation in clean environments.
When selecting between SISW and DIDW centrifugal fans, three factors should guide your decision: airflow requirement, available space, and the specific application. For compact spaces needing focused, high-pressure airflow, SISW is often the better choice. For expansive areas requiring high-volume, low-pressure airflow, DIDW fans offer greater efficiency. At Perkins Blowers, our team of experts works closely with clients to understand their unique needs and recommends the most suitable solution based on these parameters.
Both SISW and DIDW fans have their distinct advantages. SISW fans are compact, easy to maintain, and efficient at generating higher pressure, which is useful for demanding industrial applications. DIDW fans, however, stand out for their high airflow capabilities, balanced load operation, energy efficiency, and quieter performance. Their ability to handle large volumes of air while consuming less power makes them especially suitable for modern HVAC systems and environmentally controlled facilities.
As a trusted name in the Indian fan manufacturing industry, Perkins Blowers offers a full range of SISW and DIDW centrifugal fans. Our products are built using premium materials, advanced aerodynamic designs, and strict quality control to ensure optimal performance and durability. Whether you’re upgrading an existing ventilation system or planning a new industrial setup, our fans are designed to meet your specific airflow and pressure needs.
In conclusion, the primary difference between SISW and DIDW centrifugal fans lies in their inlet configuration and corresponding performance characteristics. SISW fans are best for high-pressure, localized air handling needs, while DIDW fans are ideal for high-volume, low-pressure applications in large spaces. At Perkins Blowers, we combine technical expertise with a commitment to quality to deliver centrifugal fan solutions that meet the evolving demands of industries across India. Let us help you select the right fan configuration to improve efficiency, reduce energy costs, and ensure smooth operation in your facility.
Read more : How to Select the Perfect Centrifugal Air Blower for Your Industrial Needs