Quick Answer: How do I know what size blower motor I need?

How do I know what blower motor to buy?

To buy a new furnace blower motor the old blower motor face plate will need to be looked at. The tag on the motor will say the horsepower, RPM, Voltage, and amps. The model number can be used but in many cases old model numbers don’t match up to new ones.

What size blower motor do I need?

The rule of thumb is the blower should produce 440 CFM (cubic feet per minute) of air per ton. On a two-ton system that is 880 cfm (cubic feet per minute). This usually calculates out to about a 1/4 to 1/3 HP blower motor.

How do you measure a blower motor?

Wheel Diameter: Measure the diameter of the blower wheel – the longest distance from one side of the ring to the other side. From the appropriate perspective described above you will see the wheel is spinning clockwise (CW) or counter clockwise (CCW).

IT IS IMPORTANT:  Your question: How long does replacing a car battery take?

Are blower motors universal?

Yes, most blower motors are designed to be universal, meaning that they can typically be swapped in furnaces of a different brand. This means that if you have a Goodman furnace, you may be able to purchase a blower motor that isn’t made by Goodman as a replacement.

Are all furnace blower motors the same?

There are two main types of drives in furnace blower motors: Direct drive motors connect directly to the furnace blower wheel. These are the most common, and most modern gas furnaces use these types of motors. Belt drive motors are less common for residential furnaces, as usually only very old furnaces use belt drive.

How much is a new blower motor?

Cost to Replace Central or Forced Air Blower Motor

Replacing a blower motor costs $450 on average with a typical range of $250 to $800. With a warranty, you might pay as little as $150 for labor alone. For high-end models, like those with large motors or access issues, you might pay as much as $2,000.

How many CFM is a blower motor?

However, to just ‘brutally’ answer your question, most modern vehicle blower motors produce about 1100-1500 cfm (cubic feet per minute) of airflow speed AT the fan when new.

Do blower motors get weak?

Weak airflow is a sign of blower motor failure. This part wears out eventually, meaning its fans can no longer push adequate amount of air out the vents or through window defrosters.

How long do HVAC blower motors last?

Is it part of a home heating system or on a commercial property furnace system? Even though the manufacturer states their blower motor will last two decades, we advise all clients to expect a 10-20-year life span due to age, use, and proactive maintenance.

IT IS IMPORTANT:  How do you use manual shift mode on automatic transmission?

How is Fla measured?


  1. Single Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × cos ϕ)
  2. Single Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × cos ϕ × η)
  3. Three Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × 1.732 × cos ϕ)
  4. Three Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × 1.732 × cos ϕ × η)

What is the rated amperage of the fan motor?

01 to 20 amps or more. Amperage is a measure of power being consumed by electrical device. Furnace blower motors and condensing fan motors will have the Amps labeled on a name tag on the motor. It can be simply labeled Amp or in some cases FLA (Full Load Amps) which is the max the motor is rated to run at.

How many amps should a blower motor draw?

Up to 20 Amps or more. Amperage is how much power a device is consuming. The Amps will be labeled on the motor’s name tag.

How do I increase the CFM of my furnace?

5 Ways to Improve Airflow in Your Home

  1. Check Vents and Registers. One of the simplest things you can do to increase airflow in your home is to check the vents and registers in each room. …
  2. Turn on Ceiling Fans. …
  3. Schedule HVAC Maintenance. …
  4. Consider Duct Cleaning. …
  5. Invest in a Ventilator.

How many RPM is a furnace blower motor?

The most common RPM is 1200 (1050 or 1075) also 900 (850, 825) and 1550 are used too. Most motors are single speed but can have as many as 4 speeds (3 is typical for direct drive indoor blowers on most furnaces).

IT IS IMPORTANT:  Your question: Is Porsche a rear engine car?

Can a furnace blower motor be repaired?

Standard blower motors operate at a single speed and cost around $450 to replace, including parts and labor, while variable-speed motors cost $600 and up. However, if your HVAC blower motor isn’t too badly damaged, the technician may be able to clean and repair it so you won’t have to incur the cost of a replacement.