Gas Fitter Practice Test

In what scenario would a higher horsepower fan motor be installed in a furnace?

1. To reduce noise levels

2. To improve air flow and speed

3. For energy efficiency

4. To enhance safety features

The correct answer is: To improve air flow and speed

A higher horsepower fan motor is typically installed in a furnace to improve airflow and speed. When a fan motor has greater horsepower, it is capable of moving more air through the system more quickly. This becomes particularly important in scenarios where a furnace needs to heat a larger space or when there is significant resistance in the ductwork. Using a more powerful fan motor can ensure that heated air reaches all areas of a home more effectively, leading to better temperature distribution and comfort. Additionally, in situations where the ductwork is long or has many bends, a stronger motor can help overcome those challenges by maintaining adequate airflow throughout the system. Other choices, while relevant to furnace operation, do not directly pertain to the primary reason for increasing fan motor horsepower. For example, reducing noise levels may be influenced by the design of the fan and its installation, rather than just its horsepower. Similarly, energy efficiency and safety features are important but are not the main drivers for selecting a higher horsepower motor in this context. The focus remains on the ability to enhance airflow and circulation within the heating system.