Why are my air vents so loud?

Vents can make loud whooshing noises if the supply air ducts are too narrow. Debris can also block the ducts or cause one or more vents to close. You can use a flashlight to see if the vents look too dirty. However, you’ll need to reach out to an HVAC contractor if the noise persists.

How do I stop my vent from making noise?

How to Soundproof an Air Vent (6 Ways to Reduce Noise)
  1. Block Off the Air Vent Entirely With Drywall.
  2. Fill the Opening With an Acoustic Sealant.
  3. Cover the Vent With Soundproof Curtains or Blankets.
  4. Make a Sound Maze Inside of the Vent.
  5. Stuff the Vent With Acoustic Foam.
  6. Plug the Vent Grate.

Is it normal for vents to make noise?

All air vents, meaning supply registers, ceiling diffusers, floor vents, and return grilles make some noise when the system fan is running. This is normal. Some systems are louder than others. Some systems are much louder than others.