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RLO (Radial Laufrad Ohne Motor) (Radial Impeller Without a Motor) are not ready-touse products but are designed as components for air conditioning, aeration and ventilation systems. The impellers with hub are prebalanced; the balancing status must be checked on the whole unit. They may only be operated when they have been installed according to their provisions and the safety level has been secured through use of safety equipment according to DIN EN ISO 13857 (DIN EN ISO 12 100) or other constructional safety measures.

Nicotra Gebhardt – the professionals in profiling
Nicotra Gebhardt is the first port of call for profiled impeller blades.
We brought the first hollow section airfoil blades onto the market
in 1975. Since then we have been achieving the absolutely best
efficiencies in our fans in every application.
Our engineers and technicians use the latest simulation programmes
to develop and test new designs. You can rely on the knowledge
and experience of specialists.
The plus factors of the new Generation
A Innovative blade and impeller shaped for highest
efficiencies
The entire shape of the impeller was optimised using a real
turbulence profile for the blades. This ensures that the impeller
reaches as yet unparalleled high efficiency and takes the top
position in aerodynamics.
A Optimal pressure and turbulence conditions
The re-designed impeller shape makes optimal pressure and
minimised turbulence conditions in the impeller possible. The
inclined leading edge of the blade builds pressure more evenly
minimising entry and exit losses.
A Much quieter
Thanks to their new design the blades and the impeller run with
less noise. The entire fan is thus much quieter.
The evolutionary elements
A The perfect profile
At the heart of the Evo series are the six blades with rounded
inclined leading edges and re-designed hollow profile.
They ensure minimised turbulence conditions in the impeller thus
enabling the extraordinary high efficiency of the fan.
Due to their special shape, the blades build up pressure evenly at
all sections. The result: Air circulates around the blades better and
the turbulence tends to dissipate.
This increases not only efficiency but also causes significantly
lower noise.
A The innovative high performance impeller
The re-designed high performance impeller makes the Evo series
unbeatable in matters of efficiency. To ensure this we optimised
the entire shape.
The special shape of the cover disc alone greatly improves
turbulence. The width and diameter of the impeller are in an ideal
ratio to each other.
The new hollow profile of the blades ensured that the weight of the
impeller could be markedly reduced and that, at the same time, a
high degree of stability could be reached. Pressure losses on entry
were greatly decreased.
And at the exit, where losses had been sustained before, the new
impeller shape ensures additional available static pressure