Lamb Ametek 122178-18 2-stage 8.4″ vacuum motor, 240 volt


Warranty: 30 Days

Shipping Features


New Lamb Ametek 122178-18 motor is 2-stage, 8.4 inch, 240 volt.

It has more than a 1/2″ taper at the bottom.


We HIGHLY recommend the maximum protection of your motor by using our exclusive Filtered Motor Gasket, part #MTR1500. Our Filtered Motor Gasket is the only one of its kind and only available from Central Vacuum Factory! It is specially designed by our engineers to provide your motor with years of trouble free service by filtering out dust and dirt BEFORE they reach your motor and damaging it! The filtered motor gasket fits flush and is as easy to apply as a regular gasket and will not add any height to your motor during mounting!

For our standard motor gasket, see our part #MTR511.

Protect your motors from dust and dirt by using a motor filter. This prolongs the life of your motor and is a must for all motors. See our standard motor filter part #MTR553.

Uses motor brushes part #MTR1190.

Motor Specs:

  • Motor Type: Bypass
  • Discharge: Tangential
  • Bearings: Double Ball Bearing
  • Sealed Vacuum: 145.5 inches
  • Maximum Air Watts: 685
  • Maximum Air Flow: 143.2 CFM
  • Max Amps: 7.2
  • Motor Speed: 29,577 RPM

Special Features:

  • Double stage tapered fan
  • 1500+ hours life (Curved Infinity Carbon Brush)
  • 685 Peak Air Watts
  • Up to 45% Overall Efficiency
  • High efficient cooling system
  • Lamb “Green Power Label”
  • UL recognized, category PRGY2(E47185)
  • CSA certification pending
  • Same mounting pattern as Lamb’s 7.2 tangential-bypass
  • Thermal Device for locked-rotor, blocked cooling air and running overload protection
  • Patent-pending bearing protection for wet applications

Design Applications:

  • Commercial and Residential Central Cleaning Systems
  • Car wash vac and blower systems
  • Equipment operating in environments requiring separation of working air from motor ventilating air
  • Designed to handle clean, dry, filtered air only

Installation note:

Over-tightening of the mounting screws may cause the fan casing to push into the fan blades and may damage the fans.  This situation is not covered under the Motor Warranty Program and will not be approved if submitted.  If motor is turned in under warranty and is found to have the type of damage explained above, the warranty will be denied.  When mounting your new motor, in most cases a touch BEYOND “finger tight” is all that is required to mount and seat the motor sufficiently.


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