CWEA Maintenance Technologist Practice Test

At what pressure rating would you use a blower instead of a fan?

1. 3 psi

2. 5 psi

3. 7 psi

4. 10 psi

The correct answer is: 5 psi

Using a blower instead of a fan is typically dictated by the pressure requirements of the application. Blowers are designed to handle higher pressure applications compared to fans. When the pressure needed to move air or gas significantly exceeds the capabilities of a standard fan, a blower becomes the appropriate choice. In this context, 5 psi is a commonly referenced threshold where the characteristics of a blower—such as increased efficiency at higher pressures—become advantageous. At this pressure, blowers can effectively overcome resistance in systems that require moved air at a specified pressure, which is crucial for applications such as material handling and pneumatic conveying. While other options may also suggest pressures that could justify using a blower, 5 psi is often the tipping point where the efficiency and design of blowers outshine fans for maintaining airflow against system resistance. This knowledge aligns with industry standards and practices related to air movement technology.