How to Run HVAC Duct in 2×4 Wall

To create a 2×4 HVAC duct installation, you must install furring strips. Furring strips are typically 1×3 or 1×4 boards used to increase the thickness of the wall so that the HVAC system can fit.

At first, you have to install the furring strips. They should be installed perpendicular to the studs, at a distance of 16 inches. The next step is to install the HVAC duct by cutting out a hole for it. To do this, cut the duct so that it can fit behind the furring strips. When it’s cut to fit, cover the duct with a piece of duct tape so that it doesn’t get tangled in your walls or appliances.

In this article, we are going to discuss how to run HVAC duct In 2×4 wall properly.

How to Run HVAC Duct in 2x4 Wall

What Is HVAC Duct?

An HVAC duct system controls the temperature and humidity inside a building. It draws in the outside air and circulates it throughout the facility. This keeps individuals inside the building comfortable in the winter and cool in the summer.

How Do HVAC Ducts Work?

The purpose of an HVAC duct is to create cool air or heated air available in a cooling conditioner or heating appliance and send it into the rooms. Vents are usually made of metal or plastic and are round or rectangular. The cooled or heated air is caused to flow through the ducts employing an HVAC unit and is then released into the rooms. Ducts can be installed in ceilings, walls, or flooring, depending on the plan of a structure.

How Do HVAC Duct Work

Parts Of The HVAC System

Parts of the HVAC System

The Furnace

A furnace is a heating unit commonly seen in HVAC equipment. The furnace’s primary purpose is to heat the airflow in the ducts so they can be distributed throughout the building. The heated air can then be used to heat the inside of the building, thereby increasing the comfort of its inhabitants.

The Air Handler

The purpose of an Air Handler in an HVAC atmosphere system is to distribute conditioned air throughout a building. The Air Handler has a fan to circulate air and a heating or cooling coil to condition the air. The Air Handler is ordinarily located in the basement or attic of the building.

The Ductwork

The ductwork in your HVAC system aims to provide circulated air to the different parts of the building. The ductwork is made up of a series of metal or plastic pipes that run through the walls and ceilings of the building. Air is blown into the ducts at one terminus, and then the airflow is distributed to the different rooms through vents in the walls or ceilings.

The Thermostat

Your thermostat has the capability to manage your HVAC system by analyzing the air temperature and sending out a signal to your furnace or air conditioner to turn on or off when needed to keep the internal temperature of the room at the level you want. The thermostat contains a sensor that uses data to estimate the air temperature and a switch that activates the furnace or air conditioner when needed. The thermostat is usually located on or near the wall near the floor.

The Vents

The vents in your HVAC system are used for air circulation throughout your house. The air is heated or cooled based on the season and then circulated through the ducts. Vents are used To maintain a comfortable temperature and reduce the use of heating or cooling systems.

The Filter

Air handlers are components of HVAC systems that circulate indoor air. They draw in external perspective and heat, cool or filter it and return it to the environment. Air handlers are available in different sizes and mounting configurations based on the building’s needs.

Benefits Of Using HVAC Duct

Many reasons exist for the use of HVAC ducts. Among them, regulating the temperature of a home or building is one of the most crucial. Routine HVAC ductwork will help maintain a suitable temperature in a larger house or structure used for commercial purposes. In addition, HVAC Ducts Are Easy To Install. The installation of HVAC ductwork is a simple task. All it takes to get the job done is skilled labor and several tools that help you do it quickly.

How To Run HVAC Duct In 2×4 wall


Planning your HVAC duct installation is an essential task if you want to save time and money in the long run. This article will show you how to run an HVAC duct in 2×4 wall. Before starting the process, you should prepare yourself with proper planning.

First, you have to decide where to run the HVAC duct; there are many things to consider when choosing where to install HVAC ductwork. The size of the duct will help maximize the airflow and efficiency of the unit and the wellness of the area. A functional area should include the path traced by air circulation within the ducts.

Finally, the ducts should be located in a place that is readily accessible for servicing and housekeeping.

Taking Measurement

To run the HVAC duct in a 2×4 wall, you will need to take some measurements. First, you will need to determine the width and height of the opening in the wall and the length of the duct you intend to install. Once you have those measurements, you can use a saw to cut through a hole on the wall that is the right size for the duct.

Taking Measurement

Choose the Number of Ducts According to the Area Size

Talking about air circulation in different spaces is dependent upon the space’s area, as well as on the number and length of the ducts that should be set up. Therefore, after this calculation, the number of vents to be installed in that area is determined based on each unit area, such as a square foot or foot.

As you can see, there are several factors to take into account when making this calculation, such as the shape of the room, obstructions in the way, and other factors that could affect airflow.

Cutting Hole to Run HVAC in 2×4 Wall

To cut a hole for the duct, one should first measure the center of the hole with a measuring tape, then record the measurement with a pen. After that, a level is used to draw a straight line across the surface where the hole will be cut.

Then, a saw can be used to cut along the line, maintaining the cutting edge perpendicular to the surface. After the hole is cut, use a vacuum cleaner and dust mask to clean up debris.

Cutting Hole to Run HVAC in 2X4 Wall

Installing the Duct

You’ll want to measure the duct to be confident that it will fit in the hole you measured. Then, you may want to use a saw to cut out the duct to size. You may additionally wish to use an adhesive to attach the duct to the wall. After finishing the project, you must seal any gaps or holes with insulation or caulk.

Installing the HVAC Duct

Secure the Duct

Installing heating, cooling, and ventilation systems are complex, but taking steps to ensure that they are securely attached to the surrounding surfaces can make them easier to use and maintain. One way to do this is to use tape or sealants to fasten them to the adjacent surfaces. This will ensure that they stay in place and prevent air leaks, which can degrade the system’s efficiency.

Seal the Duct

There are several ways to seal ductwork, but duct tape is the most common. First, make sure the vent is clean and dry. Then, cut the duct tape as necessary and press it around, ensuring that the seams are covered. You can also use mastic or caulk to fasten the duct, but ensure that the material it’s made of is compatible with the material in question.

Finishing Up

Once you’ve finished all of the tasks, make sure to clean the area before you leave. Make sure that all debris is removed correctly. You should also ensure that the work area is clear of any other potential hazards or dangers.

Tips and Tricks

Make sure to use metal ducting instead of plastic ducting since plastic ducting can easily break down in cold weather. When sealing plastic ducting, ensure that mastic is used rather than duct tape. Also, ensure the duct is propped up properly to prevent it from sagging in the middle.

Always Prefer Insulation Ducts

The most significant advantage to using insulated ducts is that their insulation keeps cold air inside the ducts, which can help decrease energy usage. Another advantage is that the insulation keeps the ducts’ noise levels low, making the system less intrusive.

In addition, insulation helps maintain your indoor air clean, extends the membrane’s lifetime, and finally, is used by the government in an effort to maintain energy-efficiency standards.

Avoid Shortcuts

Here are the reasons why you should avoid shortcuts when working HVAC ductwork. First, shortcuts can be dangerous to the system and lead to production issues. Second, installing most HVAC ductwork is vital to ensure it serves its owners and survives at its expected prime. By cutting corners to save time, you may decrease the longevity of your system and negatively affect its performance.


To sum up, by following the steps outlined here, you can set up the HVAC duct in a flat wall measuring two by four without any problems whatsoever. However, remember to do so with caution when working with power tools and respect all manufacturer instructions. Lastly, never forget to have fun and practice safety while fixing your HVAC system.

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