Does the Fasco B47120 provide 180 CFM of airflow?

You must confirm your ductwork offers low resistance, as 180 CFM is the volume of air moved through the system per unit of time, and you should measure your total duct length before ordering.

Fasco B47120 airflow capacity and RPM performance at three speeds

The Fasco B47120 reaches this capacity at its three speeds, which include 1360, 1100, and 830 RPM free air. Because airflow drops as resistance increases, the 180 CFM rating applies to the blower’s performance when it faces minimal opposition from the system. This matters for centrifugal blowers because static pressure—the resistance the fan must overcome to move air—can quickly throttle output if the path is too restricted. We selected the Fasco B47120 for our full review because it represents a common mid-range choice for commercial ventilation. The 180 CFM rating is based on standard conditions, but you should account for air density, which is the weight of the air in a given space, as extreme heat or high altitudes can reduce actual output.

You can see our final verdict on the Fasco B47120 performance review to see if it meets your needs.

What to Check Before Buying the Fasco B47120

Before purchasing this blower, verify these technical requirements to ensure the unit performs as expected in your specific environment.

Review the Fasco B47120 technical specifications for a complete breakdown of its mechanical capabilities.

• Confirm your electrical supply provides 115 Volts to reach the rated 1360 RPM.
• Measure your ductwork to ensure the diameter allows for 180 CFM without creating excessive turbulence.
• Verify that your application does not exceed the 1.95 amp draw of the motor.
• Check that your mounting surface can support the 8-pound weight of the unit.
• Ensure your installation site meets the requirements for a UL recognized and CSA or ULc certified component.

Comparing the Fasco B47120 to Other Centrifugal Blowers

This unit functions as a high-speed motor and impeller that flings air outward to move large volumes of air, a device commonly known as a centrifugal blower. It is a practical choice for shoppers who need a reliable, three-speed motor with sleeve bearings for standard commercial ventilation. If you require specialized industrial performance, such as high-pressure industrial ductwork, you might look at alternatives that offer higher static pressure ratings. Buyers who need precision flow control may also prefer systems with integrated variable frequency drives rather than fixed-speed motors.

If you have a tight installation, find out if the Fasco B47120 fits in 13 inches.

If you need a reliable 180 CFM output for standard ventilation and have a 115V power source, the Fasco B47120 is a solid choice. For high-pressure industrial needs or variable flow requirements, consider a more specialized industrial blower.

Reviewed by the Refrigerant Recovery Pro editorial team. Refrigerant Recovery Pro writes these guides from the 200 most-reviewed centrifugal blower listings in our retail dataset, not from manufacturer copy.