VMC Group Fan-Spring and Motor Bases are structural steel angle iron or channel rectangular bases with motorslide rails and seismic spring isolators with 1" or 2" deflection. Custom deflections are also available upon request.

VMC Fan-Spring and Motor Bases are designed for use with arrangement 1, 2 & 3 single width or double width fans with belt-driven motors. Bases can be fabricated without motor sliderails for use in other fan arrangements that do not have an integral base. VMC Group fan spring and motor bases help maintain proper drive alignment and resist starting torque. The isolator housings are identical in height within each series and come with easily accessible bolt holes for simplified installation. An elastomeric acoustical cup eliminates high frequency vibration, while color-coded springs permit ease of identification of load capacity. Spring housings have internal adjustments for use in most seismic and wind applications. Their rugged steel housing is designed to handle high wind and high seismic forces up to 2.0g.

When an equipment submittal drawing is provided to VMC Group's Engineering Services Division, a properly designed base or rail drawing, indicating seismic isolator model numbers is produced for customer approval. Once approved, drawings are provided to our manufacturing department for fabrication and shipment.

Features & Benefits

  • Multiple and custom deflections available
  • Unitized base with integral motorslide rails
  • For use with multiple single or double width fans
  • Seismic capacity up to 2.0g
  • International Building Code® (IBC) compliant


  • Fans




The engineers we employ hold the highest industry-recognized credentials in structural analysis, elastomer development and system dynamics.


We are the first ISO accredited PCA ISO-17065, third-party certification body for special seismic certification of non-structural building components and their mounting configurations by the ICC’s International Accreditation Service.

Test & Measurement

We are the only ISO 17025:2005 Accredited Seismic Simulation Test Laboratory with a triaxial shake table owned and operated by California licensed Structural engineers.

Testing Services Update
DCL now offers Nuclear Qualification and Testing services.

In partnership with Greenberry Industrial, we now offer testing services that meet the requirements of ASME NQA-1.

Call for more information.