How To Fix Bathroom Fan Squeals? – Best Methods

bathroom fan squeals

Do you recall how your bathroom fan used to eliminate moisture and odors from the area without creating the noise it does now? If the noise from your bathroom fan has ever woken up your family, this article from is all you’ll need to learn How To Fix Bathroom Fan Squeals.

Many causes can produce a noisy bathroom fan. In this post, we’ll look at the most common causes of exhaust fan noise in your home. Then we’ll go over nine various ways to silence your bathroom exhaust fan.

bathroom fan squeals

What Parts of a Bathroom Fan Can Cause Noise?


The fan blades are the fan’s moving parts. They will make some noise as they rotate in regular operation. Depending on the quality of the components used in its construction, it will be louder or quieter.

The fan may begin to create more noise as it spins if it is worn out or damaged in any way. If your fan is generating noise now that it wasn’t previously, inspect the fan and motor for wear or damage.

Make sure the fan blades are clean and free of debris. Dirt buildup might cause the fan to become too loud over time.

The sound of air moving, which is pushed by the fan, also causes noise. Any time air moves, there will be noise, which is unavoidable.


All of the work is done by the motor. It is in charge of rotating the air-moving fan blades.

Cheap fans also have loud motors that spin quickly, especially with small fans. Excess noise is created as a result of this.

If your fan has only lately begun to make noise, it is conceivable that the motor has failed. The motor will eventually fail. As the motor nears the end of its life, this can cause it to become noisy and weak.

After removing the fan cover, inspect the motor for any wear or damage. If you notice any visible symptoms of wear and tear, it’s probably time to replace it.

Check for excessive heat accumulation after allowing the fan to run for a while. This could indicate that your motor is nearing the end of its useful life.

The ductwork that your bathroom exhaust fan connects to is one of the biggest sources of noise. When your bathroom fan removes the air, it must convey it outside of your house through a vent. The ductwork is used to transport the air.

Moving air will always produce some level of noise, no matter what you do. However, there are numerous methods for reducing the amount of noise generated by air traveling through the ducts.

The first thing to remember is that increasing air pressure results in more noise from moving air. Smaller duct diameters produce more air pressure and, as a result, more noise.

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The quietest bathroom fans are usually designed to work with 6″ ducting. However, you most likely have 4″ or even 3″ duct in your ceiling right now. Switching to the larger 6″ duct could be a major hassle and expense.

If your fan is designed for 6″ duct but you only have 4″ duct, you can still connect it with a reducer. The difficulty is that you will increase the air pressure and noise produced by your fan if you do so. This means you won’t be able to attain the low sone rating that your fan claims.

Another thing to keep in mind while installing ductwork is that it should be as straight as possible. The air pressure and noise produced by the fan will increase if you perform hard turns or consecutive turns.

If your duct requires a turn or several, try prolonging the turn to reduce the effect. For example, instead of employing a 90-degree corner, you might use 45-degree connections to get the same angle.

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Mounting Brackets/Hangers

Poor mounting could be the source of a lot of the noise your fan is creating. This could be the result of sloppy initial installation or the loosening of screws and mounting hardware over time. In any case, the outcome is the same.

The vibration caused by the motor and the fan will not be contained if the fan is loose. The entire fan assembly will be permitted to move, resulting in excessive noise.

To make matters worse, the vibration will be transmitted through the ceiling and walls, amplifying the loudness.

Remove the fan’s cover. Push on the fan assembly gently to see if there is any visible movement. If the fan appears to be loose, you’ll need to figure out how it’s mounted.

It’s likely that your fan is attached to the joist using screws from below. From the ground, these would be reachable.

Bathroom exhaust fans are frequently hangered to the joists above the drywall on the ceiling. You may to enter the attic and locate the bathroom to get to these hangers.

Bathroom Fan Squeals

If the fan blades are misplaced or occluded, a persistent knocking noise will be heard while the blades rotate.

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When older or less expensive fans with inefficient motors run, they can generate a humming noise. This sound can also be heard as a motor starts to fail.

If the fan is not securely mounted, vibration noise will be produced. Vibration noise might occur as mounting screws and brackets loosen over time.


If your fan has a lot of dirt, grit, and grime on it, it might make grinding noises as it spins and grinds all of the hard matter up. This will put additional strain on your fan, reducing its lifespan.

When an older machine starts to fail, you may hear grinding from the motor. The grinding should be followed by a slowdown of the fan, which you should be able to hear in this situation.


If your fan unit becomes loose enough, it may be able to move inside the hole in which it is installed. You’ll hear the fan assembly rattling about while it functions when this happens.

If your bathroom exhaust fan is out of alignment, it may be hitting the side of the fan housing as it spins, making a loud knocking noise. This might also happen if a large piece of debris became lodged inside the fan housing.


If your fan’s moving parts become too dry, they may begin to squeal as they move, causing friction as the dry parts rub against each other at fast speeds.

Buzzing even when the fan is turned off

If you reside in a multi-unit structure, your fan may buzz even when it is turned off. This is because the duct is connected to the ducts of other people’s fans.

If another person’s fan is running, vibrations from their fan may be transferred down their duct and into your duct. The end result is a buzzing sound that appears to originate from your bathroom fan.


If your fan blades are loose, you’ll hear a quick clicking sound similar to crackling. This is caused by the blade holders colliding with the motor housing.

When a bathroom fan motor reaches the end of its career, it will often begin to emit a high-pitched whining noise. This indicates that the motor has failed and has to be replaced.

Changing out a noisy bath fan

Newer-style bath fans, on the other hand, are so silent that you won’t even notice them running, and they’re inexpensive to run. It’s not as difficult as you would think to replace that noisy, inefficient bath fan, especially if you choose one that can be fitted without knocking out the bathroom ceiling.

We chose the NuTone No. RN110 Ultra Pro Series from among the several replacement models available since the fan can be installed from within the bathroom. It’s not the quietest model on the market, but at 0.6 sones (about 25 decibels), it’s a significant improvement over the previous 4-sone (around 60 decibels) fan we’re replacing. If you know where to find a joist, how to cut drywall, and how to conduct basic electrical work, you can do the project in approximately two hours and save $200 on the installation. A stud finder, drywall saw, drill and screws, and aluminum duct tape are all required.

How To Fix Bathroom Fan Squeals

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Purchase the appropriate size for your bathroom.

A ‘one-size-fits-all’ bath fan does not exist. Calculate the needed cubic feet per minute (cfm) for restrooms up to 100 square feet by multiplying the room’s length, breadth, and height. Multiply the number by.13 and round to the nearest tenth. 10 feet wide x 9 feet long x 9 feet high x.13 = 105. Buy a 110-cfm bath fan by rounding up to 110. Simply add up the cfm needs for each of this plumbing equipment in bathrooms greater than 100 sq. ft.: toilet, 50 cfm; shower, 50 cfm; bathtub, 50 cfm; jetted tub, 100 cfm.

Before continuing, turn off the power.

The power cable from the old unit must be disconnected and connected to the new fan. This must be done with the electricity turned off. Turning off the fan switch isn’t enough; you also need to turn off the breaker. Then, using a voltage sniffer, double-check that the power is turned off. Hire an electrician to remove and connect the wires if you’re not comfortable working with electricity.

Enlarge the hole by locating the joists and duct.

Use a stud finder to locate the joist closest to the old fan on the ceiling. Make a note of the place. Then look for the joist on the fan’s opposite side.

The duct for most bath fans runs parallel to the joist and is fastened to the ceiling joist. Begin by determining the orientation of your ceiling joists. After that, look for the damper (you may have to remove the fan motor and blade from the housing). This will reveal the location of the duct in the ceiling. Make a note of where the duct is. Then make the opening bigger.

Remove the housing, duct, and fan and replace them.

Remove the old fan housing from the joist by unscrewing it. The electrical cable should then be disconnected from the housing. Finally, use a tool knife to cut through the duct sealing tape and detach the duct.

You’ll have enough area to detach the old duct, electrical cable, and housing now that the entrance has been widened. Install the new mounting frame and secure it. Connect the new housing to the electrical cable and snap it into the frame with the duct hole facing the existing duct. Then use aluminum duct tape to connect the duct, damper, and flange. Connect the power and ground cables to the electrical box provided to complete the rough-in.

The fan can then be slid into the housing, followed by the muffler and grille. Test by turning on the power. To prevent moisture infiltration into the attic, apply a bead of fire-resistant (intumescent) caulk around the fan housing and walls.

Procedure for replacement

Replace the existing fan housing with the new, quieter fan and motor assembly.

Broan and NuTone have released a new kit that allows you to practically eliminate fan noise (meaning the fan is barely audible). It just takes approximately 10 minutes to install the new fan and motor, and no rewiring or ductwork is required. Most Broan, NuTone, and Nautilus bathroom fans are compatible with the kit; in fact, most bathroom fans are one of these brands. The Bath Fan Upgrade Kit is a quieter replacement fan that fits into the current housing, eliminating the need to pull up the ceiling, and the new grille gives your fan a fresh new design.

Because this quieter fan has a more powerful motor, it will do a better job of ventilation the room. Broan’s Web site ( or most home centers sell the kit (No. 690). The kit includes everything you’ll need, including the wrench.

The upgrade kit will not function on a fan with a grille other than the two shown here.

Bathroom vent fans are essential in any shower-equipped bathroom. Bathrooms will become quite wet from the shower steam if there isn’t a functional vent fan, and mold and mildew will grow. If your bathroom vent fan is working but making noises (squealing or squeaking), it will need to be oiled before it can resume normal performance. Hope all the guides from can help you fix your fan efectively

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