In a UFAD (Under Floor Air Distribution) system, where does the HVAC system move air?

In a UFAD (Under Floor Air Distribution) system, the correct choice is moving air through the compartment under the floor. This system utilizes the space below the floor to distribute conditioned air directly into occupied areas through floor vents or diffusers.

The primary advantage of this approach is that it allows for increased flexibility in air distribution patterns. By introducing air at the floor level, it can more effectively displace warmer air that rises, thus improving the overall comfort and efficiency of heating and cooling within a space.

In contrast, air distribution methods that involve overhead ducts or ceiling ducts do not leverage this advantage. They primarily rely on traditional duct systems that can lead to uneven air distribution and can be less efficient in terms of energy use and thermal comfort. By focusing on the underfloor compartment, UFAD systems ensure a more direct and efficient delivery of conditioned air right where it is needed most.