A Comparison of Fire-Rated Cabinet-Type Centrifugal Fans and Negative Pressure Fans

A Comparison of Fire-Rated Cabinet-Type Centrifugal Fans and Negative Pressure Fans

In settings where fans are required, many users are unable to distinguish between fire-rated cabinet-type centrifugal fans and negative pressure fans. In fact, there are many differences between the two. To better distinguish between these two types of equipment, we aim to provide a brief introduction to help differentiate them. Firstly, the operating principles of these two devices differ significantly. For example, when in operation, fire-rated cabinet centrifugal fans primarily rely on input mechanical energy to increase gas pressure and facilitate gas discharge. This constitutes a fluid-driving mechanism. Negative pressure fans, on the other hand, utilise airflow to achieve convective negative pressure ventilation and cooling. They rapidly expel hot air from the room to achieve ventilation. Under normal circumstances, the cooling and ventilation efficiency of these units can reach between 90% and 97%. Secondly, the characteristics of the two devices are entirely different. First, let us examine the primary functions of the fire-rated cabinet-type centrifugal fan. This unit primarily operates on the principle of converting kinetic energy into potential energy: gas is accelerated by a high-speed rotating impeller, then decelerated and redirected, thereby converting kinetic energy into potential energy. In a single-stage unit, gas enters the impeller axially and is directed radially. After passing through the diffuser, the velocity decreases. The characteristics of negative pressure fans differ significantly from those of centrifugal fans. This unit offers numerous advantages: not only does it significantly reduce capital investment, but it also features low energy consumption, stable and reliable operation, and high operational efficiency. Furthermore, as it possesses both supply and exhaust functions, it is highly attractive to many users. In short, both fire-rated cabinet-type centrifugal fans and negative pressure fans have their respective strengths and weaknesses. Users should select the appropriate product based on their specific circumstances.