What type of centrifugal fan is commonly used in large HVAC systems?

The backward inclined centrifugal fan is commonly used in large HVAC systems due to its efficient performance and ability to handle varying air volumes and pressures with reduced energy consumption. This design allows for better airflow and minimized turbulence, which results in lower noise levels compared to other fan types. The backward inclined blades reduce the likelihood of dust and debris accumulation and provide a more stable performance in fluctuating operating conditions. Additionally, these fans are more adaptable to different system requirements, making them a reliable choice for HVAC applications where efficiency and reliability are key.