How Do You Block Sound From Air Vents? (Reduce Echo From Your Room)

Air ducts are necessary for ensuring proper air circulation in the home. However, there are occasions when these vents can be bothersome.

The vents may produce unbearable noises, leaving homeowners in misery.

You may have soundproofed your windows, walls, and even installed soundproofing curtains. Still, the sound traveling above the air vents could be frustrating.

Your efforts to soundproof the room will drain if you ignore the noisy air vents.

Typically, air vents are placed above the doors. They are found in places with high temperatures.

As the hot air in a room rises, it will travel across the door vents, which helps to reduce temperature.

Tips to block sounds from air vents

How to soundproof air vents

If you face issues with excessive noise entering your air vents, we have listed some solutions to help you.

Let’s scan them together!

Block the air vent – drywall is your savior

This tip is particularly applicable when looking for a completely soundproof room, a music studio, or a home theater.

If the heat is not a significant issue and you have ample ventilation, this measure could be pretty handy.

When you have removed the grate, fill in any gaps with insulation and then close up around it by applying a wall adhesive.

This will ensure that there are no open spaces for air to seep through!

And lastly, mix the wall texture using sandpaper and color it to go with the wall. This is a simpler version of the mentioned technique but it takes patience and skill to complete.

You have your plaster straight away, but you need it flat before sticking on the grate so they blend in with each other seamlessly once finished!

In order to avoid condensation, make sure that an AC is turned off if it’s not being used.

Applying waterproof materials before insulation and studs will also help reduce the chances of gathering in the first place!

Fill the vent with a soundproofing sealant

Ways to soundproof air vents and ductwork

Another vent soundproofing option is to fill a sealant in the wall.

The gap fillers and foam sealant will expand to cover any holes or cracks in your drywall, giving you that same satisfying outcome as traditional Wallboard Fillers.

Plus they’re airtight even though water can’t get through them!

Like the drywall method, you can even out the wall texture with sandpaper and paint it to match the whole wall.

This insulation material can be used to fill the whole duct. You will need a lot of it though; depending on how big your space is, you might want two or three layers.

Before you start working, put on your gloves.

Then remove the vent covers at both sides of the duct and fill up with something heavy like crumpled paper or sand so that there is no more air coming out when we seal it later.

The project takes about five minutes of application and another five for curing.

The sealant is water-resistant to keep it from getting wet in between applications or after a rainy day, so no need to worry!

Or, foam can be your alternate choice. You can easily blend it in the wall or plaster to achieve the consistency you are looking for. 

Use acoustic foam

Acoustic foam is an absorbing material that can be used for sound-absorbing purposes in cinemas, studios and theaters.

It’s made from polyethylene materials like polyester or extruded melamine; this type of plastic sound absorption effectiveness depends on the density (grams per cubic foot).

Acoustic foam was originally developed to reduce echo in a small space, like the room.

Now that it’s been discovered how well this material works for other applications as well–like air ducts or box offices during events–the term acoustic is being used less often and more simply just “foam.”

Acoustic foam is a great way to deaden sound waves, and there’s no shortage of it nearby. If you have leftover pieces from earlier soundproofing projects you can use them.

The first step involves opening up your vent with one screwdriver as best we can tell.

Then, put acoustic do-dads on both sides until they meet inside—not too much pressure is needed here so most people will say just use your fingertips if possible (this part really needs gloves).

Next, fix it firmly to the sides with an adhesive. Reattach the cover, and the foam will help trap and reduce the sound waves.

Thus, the noise deadens, and echoes go down.

Cover with soundproof blanket or curtains

How to Stop Noise Coming Through Air Vents

Although it is important to maintain room temperature in the hot season and activate ventilation, blocking air vents will have more negative impacts than positive ones.

The right solution is to cover the room with a soundproofing blanket or curtains temporarily.

It is an affordable and straightforward technique to cut the noise entering the air vents. It will not compromise the overall aesthetics of the room.

Soundproofing curtains are an excellent way to keep sound at bay.

The best part? You can install them on either the wall or ceiling, so they’re perfect for any size room in your house! 

All you need is a curtain rail with plenty of hooks and a thick fabric curtain—no matter what material it’s made from that will do just fine by itself.

A cover made of dense and thick material with several layers will be pretty practical for deadening the sounds.

Soundproofing materials are easily available online or you can rush to your nearby interior décor stores.

If you plan to cover air vents above the door, add the rail above the vent and drop the curtain to the floor for best outcomes.

All you have to do is open the curtains and let the air in during the summer days.

This hack for cutting noise is really amazing.

The thick and absorbent fabric of soft furniture pieces like sofas or beanbag will help cut the sound waves that cause discomfort, while also muffling outside sounds in your home.

Create a maze inside the vent

By now, you must know that soundproofing an air vent isn’t an easy task. You need extra airflow in the room to stop mold growth.

Simultaneously, it would be best if you took some measures to reduce the echoes within the room.

The best way to prevent sound from resonating is by adding absorbent materials and walls. The maze of an air vent will help bounce all the noise around.

You can use these walls to direct the airflow in a zig-zag motion. The waves will bounce back and forth many times, which makes them lose their momentum before they reach your ear!

This method will create sufficient airflow in the room and a considerable noise reduction.


Can I block an air vent?

Preventative maintenance will keep your HVAC in a functional state for maximum efficiency. Also, it would help if you did not block air vents inside your home.

Covering the ducts will not conserve energy or decrease its costs. Instead, it causes the opposite.

Why is the air coming out of my vents so loud?

The vents will make a loud, whooshing noise if the supply ducts are narrow. Also, debris can block the ducts or cause the vents to close.

You can use a flashlight to examine if the vents are dirty. Also, you must reach out to an HVAC specialist if the noise persists.

Final Thoughts

Ultimately, there aren’t any instant solutions to block sounds from the air vents. You must pick a solution depending on your needs and the room’s requirements.

In cases you want maximum soundproofing, you should opt for more sustainable and practical solutions.

Similar Posts