Centrifugal fan figures
The marking of the housing arrangement of radial fans according to PN-92/M-43011 is commonly referred to as the radial fan figure.
Depending on the position of the housing discharge opening, radial fans are produced according to the marking shown below. The direction of rotation of the impeller is specified as clockwise, clockwise – RD or counterclockwise, counterclockwise – LG. This direction is determined by looking in the direction of the fan axis from the side opposite the inlet, from the drive side.