Why should outdoor advertising screens choose centrifugal fans?

2026-05-27

The competitive focus of outdoor advertising screens has shifted from "bigger" to "thinner, brighter, quieter, more energy-efficient, more stable, and more suitable for all-weather operation". Under this trend, traditional axial flow Fans are increasingly unable to meet the heat dissipation requirements - especially in scenarios such as outdoor LCD advertising machines, shopping mall guidance screens, metro/bus electronic billboards, smart city information screens, and high-brightness LED signs. More and more manufacturers are now switching to high-static-pressure waterproof centrifugal fans (Splash Proof Centrifugal Fan). Many engineers are puzzled: "The air volume is the same, but why does the heat dissipation effect significantly improve after replacing with centrifugal fans?" The fundamental reason is not insufficient air volume, but the low static pressure of axial flow fans, which prevents the air flow from effectively penetrating the internal heat dissipation channels of the equipment; centrifugal fans, on the other hand, achieve precise and stable forced air supply by relying on higher static pressure.

1, Why does thinning out lead to failure in heat dissipation?

Outdoor advertising screens are high-density heat source systems: To protect against direct sunlight, the brightness can reach 2000–4000 nits, and their power consumption and heat generation far exceed those of indoor screens. And with the continuous thinning of the new generation of products, the internal heat dissipation space has been significantly compressed. At this point, ordinary fans, due to insufficient static pressure, have difficulty effectively discharging the heat out of the box - high air volume does not equal high heat dissipation efficiency; static pressure is the key parameter that determines the forced heat dissipation capability.

2, Why is “high static pressure” more critical than “high airflow”?

Most users prioritize CFM (airflow) when selecting fans. However, for digital signage—characterized by high airflow resistance—static pressure, not airflow, is the decisive factor for effective heat dissipation. Internal components—including heatsinks, dust filters, narrow ducts, airflow guides, power compartments, and waterproof structures—collectively create substantial airflow resistance. Insufficient fan static pressure prevents air from entering the enclosure, resulting in high-speed operation, increased noise, and ineffective heat removal. Consequently, high-static-pressure centrifugal fans have become the industry standard.

3. Why are centrifugal fans more suitable for outdoor digital signage?

Traditional Axial Fans have an axial air intake and outlet, and are only suitable for low-resistance environments; while the internal air ducts of digital signage are complex and have high resistance. The core advantage of centrifugal fans lies in their 90° radial air outlet: axial air intake, lateral air outlet. This allows for the precise construction of a directional air duct, effectively penetrating heat sinks, dust filters, and other high-resistance structures, achieving efficient heat exchange. This feature is particularly suitable for ultra-thin devices - it functions like an embedded "air duct engine", providing stable and concentrated forced air flow within a limited space.

Summary

Why are high-static-pressure waterproof fans becoming the industry standard?
Devices are continuously becoming thinner and lighter, power consumption is constantly increasing, and outdoor environments are becoming increasingly harsh - traditional axial fans have struggled to meet the multiple demands of static pressure, waterproofing, low noise, long lifespan, and miniaturization. The high-static-pressure waterproof centrifugal fan is not simply "increasing the size"; it is a system-level cooling solution specifically designed for the complex ducts of modern outdoor digital signage.

If you are developing ultra-thin display devices such as outdoor advertising screens, please prioritize the assessment of three core parameters in the early stage of heat dissipation design: fan static pressure, system air resistance, IP protection level, and long-term operational stability. This is the key to ensuring the reliability of the entire machine in terms of thermal management. If you need professional support, please contact Shenzhen Fuqingda Electronic Technology Co., Ltd. We will provide you with customized heat dissipation solutions.