How to distinguish between forward leaning centrifugal fans and backward leaning centrifugal fans?

As a widely used ventilation equipment in industries, buildings, and other fields, fans usually come in two types: forward leaning and backward leaning. However, for beginners, these two may be difficult to distinguish. This article will provide a detailed analysis of the differences between forward leaning centrifugal fans and backward leaning centrifugal fans, helping you to identify them calmly and avoid confusion.

1、 Working principle:

Forward leaning fan: The impeller of the forward leaning fan is installed on the inlet side of the fan, and the airflow enters the impeller first, and then is discharged by the centrifugal force generated by the impeller drive. This design is suitable for high temperature and high dust environments, as the inlet impeller is less susceptible to damage from dust and particulate matter.

Backward tilting fan: The impeller of the backward tilting fan is installed on the outlet side of the fan, and the airflow enters the fan first, and then the centrifugal force generated by the impeller drives the airflow out. This design is suitable for handling relatively clean airflow and is suitable for most ventilation and air supply situations.

2、 Impeller design:

Forward leaning centrifugal fan: The impeller of a forward leaning fan is usually wider and the blade curvature is greater, making it suitable for handling gases containing particulate matter and reducing blockages.

Backward tilting centrifugal fan: The impeller of a backward tilting fan is usually narrow, and the blades are relatively straight, which is suitable for handling relatively clean airflow and has high efficiency.

3、 Applicable scenarios:

Forward leaning fan: Due to its design being suitable for high temperature and high dust environments, it is commonly used in industrial fields such as furnaces, metallurgy, and cement.

Backward tilting fan: The backward tilting design is suitable for general ventilation, air conditioning, air supply and other occasions, such as commercial buildings, office buildings, hospitals, etc.

4、 Installation location:

Forward leaning centrifugal fan: Due to the design of the inlet side, forward leaning fans are usually required to be installed at a higher position so that the airflow can smoothly enter the impeller.

Rear tilting centrifugal fan: Rear tilting fans are more flexible and can be installed at relatively lower positions because the airflow enters directly from the fan without height restrictions.

5、 Maintenance and Cleaning:

Forward leaning fan: Due to the impeller being located on the inlet side, it is more susceptible to the influence of particulate matter and requires regular cleaning and maintenance to ensure normal operation.

Backward tilting fan: The impeller is located on the outlet side and is relatively less affected by particulate matter, making cleaning and maintenance relatively easy.

6、 Fan noise:

Forward leaning fan: Due to the impeller being located on the inlet side, the noise is relatively low, making it suitable for environments with high noise requirements.

Backward tilting fan: Due to the impeller being located on the outlet side, the noise is relatively high, making it suitable for environments with relatively low noise requirements.

Although there are significant differences between forward leaning and backward leaning centrifugal fans in terms of working principles, impeller design, applicable scenarios, installation positions, maintenance, and noise, as long as you have an understanding of these key characteristics, you can easily distinguish between the two. When making a choice, it should be based on actual needs and environment, and should not be blindly chosen.