UFAD (underfloor air distribution
Recently, increased attention to improved indoor air
quality, improved employee productivity, energy costs and
demands for flexible work environments in offices and
buildings have drastically increased the interest for underfloor
air distribution systems UFAD.
KE Fibertec has developed a unique air distribution system
for UFAD systems, that supplies air evenly in the underfloor void,
avoiding thermal decay of the fresh supply air that needs to be
delivered to the perimeter areas.
The fabric UFAD system is easy to install after the suspended
floor has gone down.
Working principle of UFAD
UFAD systems uses the space beneath raised floors as a plenum to
distribute air through diffusers into the occupied space. usually
passive or active swirls are used for diffusers.
UFAD systems are characterized by their ability to allow
individuals to have a degree of control of the environment around
them. UFAD systems benefit from a floor to ceiling airflow
pattern that takes advantage of the natural buoyancy from heat
sources in the occupied space.
It can be compared with a displacement ventilation
systems where a temperature stratification occurs in the
This can be used beneficially to reduce the cooling load as the
cooling load removed from the room is directly proportional to
the difference in temperature between the supply air and extracted
This results in energy savings when the cooling coil in the
conditioning unit is operating. it also means that free cooling
can be used for longer periods of the year. as a result of the high
temperature efficiency UFAD systems often qualify for leed
Potential UFAD benefits:
•Improved thermal comfort for empl oyees (individual
•Improved ventilation efficiency and indoor air quality
•Improved occupant satisfaction and productivity
•Reduced energy and life cycle building costs
•Reduced floor-to-floor height in new constructions
•Improved flexibility for building services