Belt Drive vs Direct Drive

Direct Drive is more typical on smaller blowers and generally offers lower cost, fewer components to assemble, greater efficiency (no drive losses), reduced maintenance (no separate bearings or belts) and greater reliability.

Belt Drive offers greater flexibility in matching airflow requirements when equipped with a variable pitch motor pulley and is typical of larger blowers. When equipped with a variable frequency drive (three-phase blowers), direct drive blowers can offer the flexibility of belt drive blowers.


Belt Drive: Direct Drive:
  • Transmission losses
  • Belts require tightening and
  • eventual replacement
  • Belt residue requires cleaning
  • Sheaves and additional bearings increase points of potential mechanical failure
  • Versatile speed adjustment via sheave and pulley adjustment
  • Motor is outside of air stream (high temp. applications)
  • Requires an ECM or VFD for speed control
  • Competitive pricing through Rupp
  • More efficient
  • Little to no maintenance
  • Less vibration than belt drive
  • Fewer points of failure
  • Reduced weight; more compact
  • Soft start with
  • speed control

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