A professional fireplace service company charges about $400 to do the job (parts and labor). But you can replace the blower with a complete motor/fan blower assembly yourself in about an hour for less than $140.
Next Project› Family Handyman Many gas fireplaces use a blower to drive warm air out into the room. They also have a fan speed adjustment switch so you can strike a balance between blower speed and noise level. But if the fan gets loaded with dust or the motor bearings wear, the blower will make a rumbling noise at all speeds. Sometimes it’s possible to remove the blower and clean the fan blades to quiet it. But if the blower still makes noise, it’s time to replace it.
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Step 1: Identify the fireplace air blower
Tilt out the bottom grille and shine a light inside the unit. Then snap a digital photo of the blower assembly. Locate the nameplate on the bottom of the air intake and write down the brand and model number of your fireplace.
Then order a replacement blower from an authorized dealer or an online supplier. If your blower runs but is noisy, buy just the motor/fan assembly. However, if the motor doesn’t run at all, chances are it has a bad temp sensor or speed switch. In that case, buy a complete kit. We bought just the blower for the 14-year-old Heat & Glo gas fireplace shown here.