The blower has three lobe rotors and the cylinder housing has pre-inlet channels to reduce sound emissions through pulsation cancellation. The cylinder, end plates and covers are made of EN-GJL-200.

Rotors

Three lobe rotors, sizes GM 3S to GM 80L are "one piece drop forged" steel of C45 N. GM 90S to GM 240S, the rotors are of EN-GJS-400-15, the shafts are of C45 N.

Cooling

Convection cooling via the housing surface is adequate for blowers operating within their thermal range as shown in the performance tables.

Lubrication

Bearings and timing gears are splash lubricated.

Oil free conveying (sealing)

The conveying chamber (cylinder) is sealed from the gear case and the front cover by piston ring labyrinth seals. These seals have a central, neutral chamber which is open to the atmosphere.

Timing Gears

The helical timing gears are hardened and ground. They are fitted to the shafts by the oil expanded taper method.

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