Displacement Ventilation

Displacement Ventilation is a unique, innovative concept for supply of conditioned air and ventilation of buildings. It uses the natural buoyancy of warm air to provide improved ventilation and comfort. First developed for industrial buildings, displacement ventilation now enjoys an increasing percentage of market share for many applications throughout the world. FabriDucts™ are an import component in this system.

Two basic systems for distributing climatized air


Mixed Air

– The conventional or mixed air system which, as the name implies, mixes fresh breathing air with the existing dirty (generated by a variety of things including machinery and people) air.

Displacement Ventilation

– By means of fabric duct socks, displacement ventilation slowly introduces large quantities of fresh air into the room. By utilizing natural laws, supply air is thermally stratified on the floor forcing contaminated air above the occupied environment.

Ventilation System Comparison

Before the industrial revolution and the invention of mixed air systems, the only way to cool buildings was by building them in a location where cool air was or in a location where a breeze could be channeled throughout the building. These buildings relied upon the fact that gravity would keep denser, fresher air near the ground so that the natural convection (the rising of heated air) will cause hot air to drift away to the ceiling. Displaced ventilation, using Hero FabriDuct™ does not fight gravity, but rather utilizes it, resulting in a cleaner environment and substantial energy savings. Since the air is introduced slowly, there is no mixing of dirty and fresh air.


Improved ventilation efficiency, resulting in better indoor air quality.

  • Harmful gases and particulates are eliminated from the breathing space
  • Air is thermally stratified from floor to ceiling so that clean air is where people need to breathe it
  • There are no drafts because of the linear slots in the FabriDuct™.

Energy savings – the higher supply air temperature results in greater opportunities for use of airside economizers.

  • Reduced ventilation loads (quantity and temperature of supply air) means reduced fuel and electric costs
  • Improved worker and occupant comfort and health in the occupied zone

Improved acoustics – the low velocity air supply should generate less noise than a typical supply diffuser.

Placement Options