EC92-137:A300-A500
The highlights of X-Accel series is it's one-piece design of
impeller and inletring / fan housing.
The blade tips go directly into the inletring, where it acts as a
diffuser. The impeller has the largest outflow angle possible.
Due to its pressure-increasing effect the diffuser reduces outlet
losses and increases the fan's efficiency. The diffuser also helps
to reduce the noise.