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BMS Controls Articles

What is a Underfloor Air Distribution?

What is a Underfloor Air Distribution?

Underfloor air distribution (UFAD) is an innovative way of delivering air via the floor, rather than through traditional ceiling-mounted ductwork. UFAD systems can save energy and improve indoor air quality compared to conventional systems. But what exactly is UFAD and how does it work? In this article, we’ll explore the basics of UFAD systems and discuss their advantages for both residential and commercial applications. We’ll also look at how UFAD can help reduce operating costs, improve occupant comfort, and increase sustainability. Finally, we’ll cover some of the challenges associated with UFAD systems, so you can make an informed decision about whether or not they’re right for your needs.

What is UAD?

A UAD is an underfloor air distribution system. It is a method of heating and cooling a space by circulating air through a network of ducts that are installed beneath the floor. The advantage of this type of system is that it can provide evenly distributed, comfortable air temperatures throughout a space without the use of noisy and energy-intensive HVAC equipment.

Components of a UAD System

A UAD system typically consists of four key components: an air handler, diffusers, supply grilles, and return grilles. The air handler is responsible for conditioning and circulating the air throughout the space. Diffusers are installed in the floor and provide airflow to the occupied space. Supply grilles are installed in the ceiling and deliver conditioned air from the air handler to the diffusers. Return grilles are installed in the floor and allow for return air to be pulled back into the air handler.

The Benefits of Underfloor Air Distribution

Underfloor air distribution (UFAD) systems are becoming increasingly popular in office buildings. Their low profile and flexibility allow them to be easily integrated into new or existing buildings. UFAD systems have a number of benefits over traditional HVAC systems, including improved indoor air quality, energy savings, and reduced noise levels.

Indoor air quality is improved with UFAD because the system delivers air directly to the occupied space, rather than through ductwork. This allows for better control of the temperature and humidity levels in the space, which can lead to reduced occurrences of sick building syndrome symptoms. Additionally, UFAD systems can be equipped with filters that remove contaminants from the air, further improving indoor air quality.

Energy savings are achieved with UFAD due to its lower airflow resistance and ability to operate at lower temperatures than traditional HVAC systems. The reduced airflow resistance results in less energy being required to move the same volume of air, leading to significant reductions in heating and cooling costs. Additionally, because UFAD systems can operate at lower temperatures, they do not require as much cooling capacity, which also leads to energy savings.

Noise levels are reduced with UFAD due to its lower airflow velocity and quieter fans. The lower airflow velocity results in less noise being generated by the system, while the quieter fans produce less background noise. This can create a more comfortable working environment for office workers and occupants of other buildings with UFAD systems.

How to Install a UAD System

Installing a UAD system is not as difficult as one might think. The first step is to determine the best location for the unit. It is important to consider the path of the ductwork and where the registers will be located. Once the location is determined, the next step is to cut a hole in the floor for the unit. The hole should be large enough to accommodate the unit and any necessary ductwork. After the hole is cut, the unit can be installed and connected to the ductwork. Finally, registers can be installed in the desired locations.


In conclusion, underfloor air distribution is a great way to effectively and efficiently distribute conditioned air throughout your home or office. It promotes healthier indoor air quality, more even temperatures in each room, and can save you both money and energy in the long run. If you’re looking for a cost-effective solution that will keep you comfortable while conserving energy, an UFAD system might be just what you need!