Fabric duct ventilation with KE DireJet System
DireJet System combines the best of displacement ventilation
with more traditional mixing type ventilation.
The KE DireJet system is a polyester fabric
duct system, engineered to introduce a majority of conditioned
air into buildings at low air velocities, with a portion of the air
directed through nozzles into the space where it is needed.
Displacement ventilation introduces air into a room at very low
velocities. Laboratory tests and real world experience have shown
that heat sources in a room (humans, machines, etc.) generate
sufficient rising heat to pull the warm air up and out of the
Cold air from the fabric duct replaces (or displaces) the hot air
as it leaves the room. In the occupied zone, displacement systems
create as little as 30 FPM velocities, resulting in a very
comfortable working environment.
Years of practical experience and research have shown that a
fabric duct with nozzles are superior to ducts with slots, or
simple holes cut into the side. The reason is simple: control.
Air enters the fabric duct at velocities of up to 1500 FPM. Simple
slots or holes cannot control the direction of this high velocity
The KE DireJet System uses nozzles which force the air to turn the
corner, and blow from the fabric duct perpendicularly.
Nozzles have long been used in the HVAC industry to increase the
velocity of air and direct it where it is needed. The KE
DireJet nozzles increase the velocity of the air as it is
discharged from the fabric duct. The result is an increase in throw
of up to 30% compared to a fabric duct with simple slots or
A complement to the superior function of KE DireJet systems is the
washability of a fabric duct. Airborne particles trapped by the
fabric duct can be easily washed out. Each fabric duct is comprised
of smaller sections, each zippered together. The smaller sections
are designed to fit into any commercial washing machine.
Each fabric duct is suspended from an aluminum track system
- a bead along the top of the duct allows maintenance personnel to
slide the fabric duct off its track from a single location.
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