Why Does My Bathroom Vent Make Noise. Worse yet your old bath fan may not be moving enough air. The gurgling sound is caused by air being forced through water in your drain trap.
These flapping noises come from the wind blowing from the other side of the house which pressurizes it on one side and depressurizes it on the side of the exhaust hood. If the bath fan in your home is more than 20 years old chances are its pretty loud. Some bathroom vent fan models require maintenance oiling.
If the drains are blocked an air pocket will form there.
Gurgling drains are usually caused by obstructions in the venting system. Some bathroom vent fan models require maintenance oiling. The noise is because the flapper is hitting on a metal to metal surface. Worse yet your old bath fan may not be moving enough air.
