how to quiet a noisy furnace blower

How To Quiet A Noisy Furnace Blower- A Complete Guide

There’s nothing more frustrating than a noisy furnace. It can be difficult to get a good night’s sleep when your furnace is blaring away in the background. 

If you’ve been struggling with a noisy furnace, don’t worry – we’re here to help! In this blog post, we will discuss the different causes of furnace noise and how to fix them. 

We’ll also provide some tips on how to keep your furnace running quietly all winter long.

What Is A Furnace Blower?

A furnace blower is a device that helps circulate the air in your home. The blower is responsible for moving heated air from the furnace through the ductwork and into the rooms of your home. 


How To Quiet A Noisy Furnace Blower: A Complete Guide

If you’ve ever heard a screeching, Loud Noise coming from your furnace when it’s turned on, you’re not alone. This is often caused by the furnace blower and can be annoying. 

In this guide, we will walk you through how to quiet a noisy Furnace Blower Motor. We’ll cover everything from identifying the problem to fixing it permanently. 

If your Blower Fan is noisy, there are a few things you can do to try and quiet Furnace Noises,

Check For Blocked Blades

First, check to see if anything is blocking the blades of the blower. If something is blocking the blades, this can cause the blower to be unbalanced and produce more unwanted noise. 

  • To fix this, simply remove whatever is blocking the blades and make sure that they are free to move freely.

Check The Motor Mounting

Check the motor mounts to see if they are loose. If they are loose, this can also cause so much noise. 

  • To fix them back up, use a wrench or screwdriver to tighten the bolts that hold them in place.

Try Lubricating The Blower Motor

Another thing you can try is lubricating the blower motor. You can do this by adding a few drops of oil to the oil port on the motor. This will help to reduce friction and make the motor run more smoothly.

Belt System 

If your furnace has a belt-drive system, another way to quiet a noisy furnace blower is to adjust the tension on the belts. To do this, you’ll need a wrench or screwdriver. 

Once you’ve located the adjustment bolts, turn them clockwise to tighten the belts or counterclockwise to loosen them.

Finally, if none of these methods work, your furnace blower might just be old and in need of replacement. 

If this is the case, it’s best to consult with a furnace repair professional to see if a new blower is needed. 

They will be able to properly diagnose the problem and recommend the best course of action.

Causes Of A Noisy Furnace Blower

There are a few different reasons your furnace blower might be making noise. Here are the five most common causes:

Dirty Or Dusty Blades

If your furnace blower blades are dirty or dusty, they can start to make a lot of noise. To clean them, simply turn off your furnace and use a soft brush to remove any dirt or dust build-up.

Loose Bolts

Another common cause of noisy furnace blowers is loose bolts. To fix this, simply tighten any loose bolts with a wrench.

Worn-out Bearings

Worn-out bearings can also cause your furnace blower to make noise. To fix this, you’ll need to replace the worn-out bearings with new ones.

Misaligned Blades

If your furnace blower blades are misaligned, they can also start to make noise. To fix this, simply realign the blades using a screwdriver.

Damaged Motor

Finally, a damaged motor can also cause your furnace blower to make noise. If your motor is damaged, you’ll need to replace it with a new one.

Others causes

  • Ignition Malfunction 
  • Metal rubbing
  • loose pulley 

If your furnace blower is making noise, don’t worry! There are a few different things you can do to fix it. With a little bit of troubleshooting, you should be able to quiet down your noisy furnace blower in no time!

Noises A Furnace Often Makes

Anyone who has ever had a furnace will attest to the noise they make, particularly when they require maintenance.

Some of the most typical furnace noise problems and what they might indicate are listed below.

 Squealing Noise Or Screeching Sound

The screeching sound is typically made by a loose belt that has unfastened, and it is noticeable noise. 

Whether you hear this sound, you might be able to take the belt off and check to see if it has come free; if not, get assistance from a professional. 

If your furnace is older, you may need to apply lubrication yourself because screeching can also occur when there is a lack of it.

Banging Noise

This could be accompanied by a whistling or whooshing sound and is typically the result of an issue with vents, filters, or ducts. 

Most of these can be cleaned by you, so give it another go and see if that works. If not, the ducts may need to be changed out for bigger ones.


A loud rumbling could be generated by the fuel ignitor or the burner, which is a significant issue that shouldn’t be disregarded. 

Call for assistance right away if you hear something similar because waiting could result in an explosion or fire.

Rattling Noise

The furnace’s interior parts may rattle for a variety of reasons, but it usually means that they are vibrating. 

When the unit is off, you might be able to determine by peering inside if a piece has either come loose or entirely fallen off.


This noise, which typically sounds like metal scraping, is caused by a furnace component coming loose. 

This might be the motor mount, or it might be a loose wheel or pulley, all of which should be checked out while the engine is off. 

It’s not always difficult to replace these components, but if you’re not sure where the problem is coming from, get assistance.

other fan motor annoying sounds

  • Humming noise 
  • knocking noise 
  • Whistling Noise

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