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How to Close Off Old Floor Vents: Trouble Free 4 Steps [DIY]

How to Close Off Old Floor Vents

Last Updated on December 15, 2022

Maybe you had some heating or cooling issues in the past and you want more control over the temperature in your home. Floor vents can be a major source of drafts and wasted energy in your home. They can let in contamination and other allergens that can make your family sick. 

When you know how to close off old floor vents and properly sealed they can keep homes at a comfortable temperature. Closing off these vents can help you make your place warmer in the winter and cooler in the summer and save you money on bills.

Whatever the reason, you have decided to close off those old floor vents. We have created a guide with simple steps to follow that will let you improve your home’s energy efficiency.

How to Close Off Old Floor Vents : Full Guide

A Simple Guide on How to Close Off Old Floor Vents

If you’re considering an update to your home’s flooring, you may be wondering what to do with those old vents. Here’s a quick guide with some popular methods

Measure and Cut a Piece of Wood to Fit the Vent

When you’re ready to close off an old floor vent, the first step is to measure the opening. You’ll need to know the width and height of the opening to get the correct size of the cover. 

The easiest way is to use a tape measure. To find the height, width, and length of the vent, place the ruler or measuring tape on the sides of the vent from one opening to another.

Once you have all of these measurements, you can now get your wood or any other fitting material cut to the size and place it on top of the vent.

How to Attach the Wood to the Vent?

Before you attach it to the wood, cut a wooden block to size using a saw to fit the opening. Then sand the edges smoothly. Apply a bead of wood glue around the edge of the vent and then place the piece of wood on top. 

Use clamps to hold the wood in place while the glue dries. Once the glue has dried, remove the clamps. After that, use a drill to fasten the plywood onto the vent with screws.

Stain or paint the wood to match your flooring

Use a brush or sponge designed for staining to apply several thin coats of stain or paint rather than trying to cover the entire surface in one thick layer. For painting, start with a primer and then apply the paint in thin layers. 

To stain the wood, use a clean cloth to apply the stain in the direction of the grain. Wipe off any excess stain with a clean cloth. Allow each layer of coat to dry completely before adding the next to prevent any bubbling or peeling.

Apply Weather Stripping Around the Edge 

To install weatherstripping along with the ventilation cover wood, start by removing the old weatherstripping if present. Next, clean the surface of the wood with a damp cloth. Then, cut the weatherstripping to size and apply it to the wood using an adhesive.

Apply the weather strip along the perimeter of the vent cover, using your fingers to press it into place. Make sure that the adhesive side is facing down. Installing weatherstripping is a quick and easy way to improve the energy efficiency of your home.

How to Properly Maintain New Closed Off Floor Vents?

How to Properly Maintain New Closed Off Floor Vents

New closed-off floor vents won’t do their job if they are not properly maintained. Here are a few tips to keep in top condition:

  • Check the vents regularly for blockages. If you see any trash, use a vacuum cleaner with a soft brush attachment to remove it.
  • Don’t use harsh chemicals to clean the vents. A mild soap and water solution is all you need.
  • Make sure the vents are clear of furniture and other obstacles. This will ensure that warm or cool air flow freely through the vents and into your home.
  • You should also vacuum the area around the vents on a monthly basis to remove any dust particles that might clog the vents.

Why You Should Close Off Old Floor Vents?

There are several good reasons to close them off. Floor vents can also have a big impact on your energy bill. If you’re looking for ways to save money and increase comfort, closing off your old floor vents is a great place to start.

By closing off old flooring holes, you can improve the airflow inside the home and reduce the amount of energy needed to heat and cool your space. Also, reduces noise levels and creates a more comfortable living environment.

When most people think about energy efficiency, they think about insulating their walls and windows. Open vents can let in dust and other airborne particles, which can settle on your floors and furniture. They can also let in drafts of cold air, making your home less comfortable and costing you more money to heat. 

Another can be a safety hazard, as small children or pets could accidentally fall into them. Vents on old floors can be tempting to leave open, especially if they’re in an out-of-the-way place where they won’t be noticed.

What are Floor Vents and Why Do We Have Them?

What are Floor Vents and Why Do We Have Them

Floor vents, also called floor grates, are metal grates that cover openings in the floor, essential for the proper functioning of your HVAC system.

They are usually found in older buildings and are used to allow heat to rise from the basement or lower floors to the upper floors to flow freely throughout your home.

While they are a necessary part of heating a building, they can also be a poor energy-inefficient source. Poorly maintained floor vents also contribute to noise pollution and lead to higher energy bills.

In short, they are an essential part of many buildings but need to be properly preserved to function correctly.


1. Is It Ncessary to Close Off My Floor Vents?

There’s a lot of debate on this topic, but our answer is usually: “it depends”. Whether in good condition and you’re comfortable with the air conditioner in your home, then there’s no need for them to be closed. 

If your vents are old or in poor condition, closing them off may be the best option. Poorly maintained air vent cover can leak to high utility expenses and drafts in your home. 

Your heating and cooling systems can also be stressed by closed vents, leading to premature wear and tear. The decision of whether or not to close off your vents should be based on your specific circumstances. 

2. Does Closing the Floor Vents Damage a Heating System?

The answer depends on the type of heating system you have.

If you have a forced-air heating system, closing the vents will probably damage the system and reduce its efficiency. That’s because these types of systems rely on airflow to disperse heat throughout the house.

When vents are closed, the system has to work harder to move air, which can damage the fan and other components. Closed vents can cause trapped air and pressure build-up, which can lead to leaks.

If you have a radiant heating system, it may not cause any problems. That’s because these systems circulate heat through pipes instead of air ducts.

They are not as affected by changes in airflow. Closing the vents might even help to improve the efficiency of radiant heating systems by preventing heat loss through the vents.

3. Can You Cover Up Floor Vents?

It is possible to cover up vents on the floor. Several options are available to do this, and the best option for you will depend on your specific needs. One option is to use furniture to block the vents. This can be as simple as placing a couch or bookcase over the vents. 

Another is to install rugs or carpeting. If you choose this route, ensure that the materials you select are durable and can withstand high temperatures. You also need to be careful not to block too much of the vent, as this can reduce its efficiency.


Knowing how to close off old floor vents, you can finally put your mind at ease. No longer will you have to worry about cold drafts or heated air flow escaping through the cracks. Over time, these vents can become clogged. There are a few different ways to close off a floor vent. 

Some popular methods have been presented to you above. Each method has its own benefits and uniqueness. Insulation is the more affordable option, whereas sealants are easier to install and provide a better seal. No matter which method you choose, closing off your flooring openings is a simple process.

How to Close Off Old Floor Vents: Trouble Free 4 Steps [DIY]

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