Versatile Enclosures Protect VFDs – and Installers


Variable frequency drives (VFDs) from 100-500 HP generate significant heat, and their size and weight make them difficult to install. Now Hoffman and Graybar have a safer, comprehensive solution for housing VFDs: WEATHERFLO HD enclosures.

Designed specifically to house VFDs in extreme environments, these proven enclosures provide integrated cooling via high-performance, shielded impellers to protect VFDs. Aluminum construction provides a strong yet light weight solution that supports up to a 500 HP and is easy to handle and install. Flexible back panel loading delivers easier and safer installation, and stainless steel mesh screens in the top and base protect against external debris. WEATHERFLO HD simply is the most complete assembled solution for meeting the demands of heavy duty VFDs in challenging applications. For complete details, contact your Graybar representative or call 1-800-GRAYBAR.

Features at a Glance

  • Innovative Back Panel Loading – Facilitates horizontal or vertical panel installation from the rear, allowing easier and safer installation
  • Shielded Impeller Packages – Provide 840 actual CFM per impeller, shielded to prevent seizing, keep bearings dust-free
  • Stainless Steel Hinges – Ensure door operation in wet environments
  • Stainless Steel Mesh Screen – Protects intake and exhaust areas from animal/human interaction and debris
  • Robust Construction – Supports up to 500 HP VFDs in extreme outdoor applications
  • POWERGLIDE® Handles – Offer secure, smooth operation
  • Gangable – Ability to expand with the control demands
  • Vented Base – Includes innovative recessed louver design, reduces interference points
  • White Textured Paint – Durable finish, aids in heat dissipation, low solar absorption
  • UL Type 3R Certified – Tested for reliable protection in extreme conditions

Hoffman WEATHERFLO HD Brochure

Overview of the Hoffman WEATHERFLO HD Enclosure system.

Hoffman WEATHERFLO HD Spec Sheet

Hoffman WEATHERFLO HD specifications, features and benefits.

Recommended Applications

  • Water/wastewater
  • Irrigation
  • Pulp and paper
  • Mining and boring
  • HVAC
  • Oil and gas