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Why Does The Blower Motor Make Such a Loud Racket?

A loud rattling furnace is a symptom of another problem that should be resolved before total furnace failure.

The Furnace Fan Motor Makes Loud Rattling Noises?

There are a number of ways to reduce the furnace noise and determining what that noise is coming from is paramount. If you have positively confirmed that the noise is coming from the blower assembly (fan motor) you are on the right web page.

Here is what can cause those annoying rattling noises.

Loose bolts and screws. Home forced air furnaces and other HVAC equipment vibrate. After many years those nuts and bolts can become loose or worn.
Loose furnace panels. Most older home furnaces have poorly fitting door panels and burner compartment panels.
Newer HVAC equipment, home furnaces, are built to a higher standard now, post 2010, and seal much better due to federal regulations concerning energy efficiency. These doors can make noise due the vibrations of the fan motor.
Out of balance blower wheel. It is a misnomer to call the blower assembly in your home heating system a fan motor. It is not a fan motor as there is no fan. It is a blower motor because the squirrel cage is called a blower wheel. On the blades there are thin pieces of steel pinching the blade. These are weights  that balance out the wheel much in the same way that automotive tires and wheels are balanced. These weights can be lost during improper cleaning or can just become worn and fly off the wheel. We all have experienced an out of balance washing machine. Your furnace does the same thing.
Dirty blower wheel. When dust and debris buildup on the blower wheel they build up evenly and the balance is usually not affected, performance does decrease though. Occasionally a large chunk of this debris (mostly dead human skin) breaks free and becomes stuck in a different part of the wheel throwing the balance of the blower motor off.
Pieces of filter, tape or inner duct lining stuck in the wheel.
Worn out bearings in the motor.
The blower speed set to high. This goes more too general noise rather than furnace rattling.

The key to keeping your furnace fan motor quiet and efficient is to keep it clean. A high quality filter and regular maintenance are the most beneficial things that you can do to protect your home furnace investment. Click on one of the coupons and receive a home furnace maintenance for a very affordable price.