Which statement does NOT apply to backward inclined fans?

The statement regarding backward inclined fans having an overloading BHP horsepower curve is not accurate. Backward inclined fans are designed to operate more efficiently across a range of conditions, and their horsepower requirements don’t exponentially increase with decreasing airflow. Instead, they generally maintain their efficiency and performance, which is a hallmark of their design.

Options that indicate higher efficiency, self-cleaning properties, and the ability to handle varying air volumes highlight the beneficial aspects of backward inclined fans. Higher efficiency means they consume less power for the same output, while self-cleaning is due to their design minimizing dust and debris accumulation. Additionally, their ability to handle varying air volumes makes them versatile for different applications, distinguishing them from fans that might struggle with similar conditions.