Do I need an air vent for my sealed-up fireplace?

Wondering whether to get an air vent for your sealed-up fireplace? As the world progresses, modern-day people are now closing their fireplaces. Most people are doing this because of the boom in what's known as internal heating features.

It is because we now know that chopping down trees for firewood harms the world. Many people would instead use heaters or air conditioning when looking for solutions.

This is a much more comfortable and more sustainable approach to warming your house. The only challenge is that if you have got a chimney, it can render all the heating features of your home pointless.

This is because cold air can still come in from outside. People have resorted to sealing up their unused fireplaces using bricks.

This is where the dilemma comes in. You have a space in the house utilised for charcoal, and other dangerous fumes, is it wise to close it up and leave it be?

This will discuss the importance of allowing it through your sealed fireplace. We will look at the cost involved, as well as the necessity of the procedure.

Is it necessary to have an air brick when blocking up a fireplace?

In any house, the structure is well dependent on the house's ability to deal with moisture. If you had a chimney, then the moisture absorbed will be different from normal once you seal the chimney.

Not to mention that all chemicals that come when burning wood have now stuck to the chimney walls. These chemicals will now mix with the moisture that is inside the ventilation system.

This mixture combined can begin to destroy a way out of the bricks used to build the chimney. The lack of airflow will form insulation and end up creating moisture.

Does it cost a lot to put a vent panel into a bricked-up fireplace?

In some cases, we could say that it is expensive to put a vent panel into a sealed-up fireplace. This depends on the kind of house that you have.

If you have got an average-sized modern house, then this procedure will not be very expensive. You will only need in most cases to seal up the bottom side of the fireplace.

If you do this well enough, then the top of the chimney will remain open thus providing a ventilation system. You will not need to insert one in this case. For some, it might be more complicated; for example, some chimneys go through many stories and end up at different parts of the house.

You may need to install a chimney cap or add a brick vent somewhere along the line in such a situation. This process requires expertise but is not very expensive.

Questions and Topics

How an unvented fireplace can encourage damp, i.e., no draught.

When you have a space such as a fireplace that has been open and experienced a whole array of gas passes through. When you close this and allow this space to become infiltrated by both hot and cold, it will be a damp space. You will need to understand that there is no place for the moisture to go.

It will then begin to start breaking down the bricks around it through air penetration. This air penetration is quite dangerous because people often do not notice it for years.

The chimney is one of the main structural foundation points and if this collapsed the house may. This is one of the main dangers that you can expect if you seal your fireplace without an outlet for moisture.

Should I install an airing brick or a ventilation panel? Which is more cost-effective?

An airing brick is the cheaper option in this scenario. It has a fancy name but in a simple what it is a hole in the chimney along the line.

Some bricks come with holes in them that can feature many different patterns and shapes. This is what's referred to as an airing brick.

When you are sealing up your brick instead of excellent bricks, you can ensure that one or two are airing bricks. This will allow the moisture to come in and out as it needs to. If you would like to use a ventilation panel, this would be more expensive.

You have to buy a ventilation panel with a specific mechanism to ventilate chimneys. This is a more high-class option, but, they perform the same task.


In conclusion, sealing up your fireplace will come with a lot of challenges. This should not stop you from moving to a more sustainable way of warming up your house. Climate change is a severe problem and if you intend to move to more greenhouse ways, then thumbs up to you.

It would be wise to put an air vent somewhere along the line. Doing this will prevent a buildup of moisture and protect your house’s structure. Doing this is quite simple; all you will need is an air brick.

If you have a more complicated roof, you may need to use a ventilation panel at different points and the chimney. It is also important to remember that it will be costly to change your mind once you have done this. It may also affect your property’s price value seeing as you cannot sell it as having a working chimney.

About The Author

Reece Thompson: Reece has been involved in property in one way or another for the past 10 years. He's gained a lot of experience when it comes to the home, kitchen and garden. He shares his knowledge with enthusiasm and honesty.