KE Fibertec markets two products for fabric-based
displacement ventilation: the Impulse System and the
Impulse D and ½D System.
The Impulse System is produced using round ducts (Ø), while
the Impulse D and ½D Systems are produced using half-round (D), or
quarter round (½D) ducts.
The air distribution principle for horizontal low impulse
systems is based on passive thermal displacement where the air is
supplied at a lower temperature in relation to the air in the
Because of the difference in density, with the cooled air being
heavier than the warmer air in the room, the room air is displaced
below the duct while the supply air continues moving towards the
The air flow in the room is then based on natural air movements
where the air is driven by the difference in density and convection
streams from heat-releasing activities and processes, hence the
term "passive thermal displacement."
A high level of heat activity from heat sources generates bigger
convection currents, resulting in the air rising more strongly and
greater entrainment of the air around the source. This then results
in stratification in the ventilated room where heat and pollution
are drawn away from the occupied zone and extracted under the
A low impulse system can only be used for cooling purposes or for
distributing large volumes of isothermal air, as warm air will
settle under the ceiling like a blanket. When this happens, the
supply air is short circuited, which means a waste of energy.
Read more about the Impulse
System in our catalogue