Bathroom fans are in almost every bathroom. Many are designed to be quiet while some are designed to be loud and cover up any noises that might be made. Sometimes a quiet fan turns into a loud fan, either gradually or overnight. There are a multitude of reasons why a fan might get noisy, and most of them are an easy DIY fix, but a few require replacing parts or even the whole unit.
Needs Oil Sometimes a bathroom fan is just like any other machine if it makes noise: it needs oil. Just a drop or two of 3-in-1 oil where the shaft of the fan meets the motor should do the trick. Sewing machine oil or gun oil will also work. Experts recommend to never use WD-40 on a fan, as that will remove any lubrication that may be deeper in the machine and cause more problems than its worth.
Dirty Blades or Motor Let's face it, bathrooms are dirty, no matter how much they get cleaned. With all the dust and damp air that gets blown through a bathroom fan, the blades will often get caked up. With all that extra drag on the blades, the motor works harder than it should to keep the air moving, and get noisy. This can be fixed by wiping down the fan blades with a damp cloth, then vacuum out the rest of the fan housing and motor.
Loose Housing Even the smoothest running fan vibrates, and all that vibration can eventually shake the mounting screws loose. Loose screws mean a loose housing and a lot of extra noise. The fix for this problem is just a screwdriver and some elbow grease. Caulk can also be applied around the edges or in the corners where it might be loose, but there are no screws to hold it down.
Bent Fan Blades Bent fan blades is a bit rarer than other problems with a bathroom fan. Aside from the tilt that all fans have to make the air move, the blades of a bathroom fan should be flat. Any bending can cause the blades to hit the housing, causing noise and friction. If the blades are metal, bending them back into shape quickly is the best remedy. If the fan blades are plastic, they will have to be replaced.
Duct is the Wrong Size or Misshapen Ceiling mounted fans should be ducted out to a vent on the roof with a duct that is as straight and wide as possible. If the duct is too small in diameter, it will restrict the airflow and amplify any noises. Flexible duct hose is prone to becoming misshapen, especially in areas with hot summers and cold winters. Bends in the hose can collect condensation forming pools of water. In either case, the duct would need to be replaced.
Motor is too Small In any fan, the motor must be the correct size and horsepower for the blades. In bathroom fans especially, installing a motor that is too small is a common cost-cutting method. This causes the motor to work too hard, and become noisy, or burn out entirely. If this is the case, the motor will need to be replaced.
Many things can cause a bathroom fan to get loud. Most of them are easy fixes. But if home repair is not a personal talent, definitely seek the help of a trained professional.
For an electrician, contact a company such as ATT Electric Ltd.
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