How to Determine If Your Furnace Has One or Two Motors

Posted by Nina Harlach on 10/17/2018 to Help
How to Determine If Your Furnace Has One or Two Motors

We’re officially at the time of year where homeowners, business owners and the like all over the country are beginning to turn on their furnaces for the next several months.  With this, unfortunately, some may notice that their furnace is not working up to par and may need a new motor or other replacement parts to get it working as good as it should be. 


The thing about modern furnaces is that they differ a little bit from their older relatives.  The vast majority of furnaces today actually contain two motors, as opposed to older ones that typically only contained one.  Modern-day furnaces have two motors because it improves overall energy efficiency, so it’s a good thing, but can be confusing to homeowners at times when trying to diagnose a common problem – not knowing which motor should be repaired or replaced.


If you do have a furnace with two motors in it, know that they are two completely different parts, so if one needs to be replaced you will need to locate the correct one in order to find its exact replacement part to repair your unit. 


How to decipher between the two motors:


                1. The main motor in the furnace is called the blower motor.  This motor blows heat into the house (or cool air in the 

                    summer for air conditioning).  The main blower motor is usually 1/6 – ¾ horsepower, multiple speed, and around 

                   1075 RPM.


                2. The second motor is typically smaller with a much higher RPM.  This smaller motor blows the exhaust out of the house 

                    and can be referred to as a draft motor, vent motor, inducer motor, purge motor, exhaust blower motor, etc.


It is important to note that not all furnaces contain the second motor listed above, but if you have a relatively new furnace, there is a good chance your furnace contains both motors.


If you need assistance with purchasing a new motor to repair your furnace, please give us a call today at 866-236-3848.  One of our Part Experts would be more than happy to help you find the right part to fix your furnace unit. 




Thank you for reading!  Visit the rest of our blog to see weekly posts for more information and tips for your household appliances!

Browse our main website to find new affordable OEM parts for your major household appliances.


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