Greenheck Introduces Tornado Dampers

September, 2012

Greenheck Introduces Tornado Dampers

Heavy duty Greenheck tornado dampers are double flanged channel frame style backdraft dampers designed to protect against tornados and rapid pressure changes. Installed in ductwork, or wall mounted, near the exterior of a building. Greenheck tornado dampers allow for air movement (intake of exhaust) during normal weather conditions. If a tornado passes near the building, the negative pressure caused by the tornado will cause the damper to close and prevent the collapse of the ductwork. Once the tornado has passed and the pressure equalizes, the spring-loaded blades will return the damper to its open positions and revert back to normal ventilation. Model HTOD-330 will close in the same direction as normal flow and model HTOD-331 will close in the opposite direction as normal flow.


Greenheck, the worldwide leader in manufacturing and distributing air movement and control equipment, offers the most UL certified dampers and the largest selection of AMCA licensed dampers in the industry.

To obtain more information about this Greenheck announcement you may:

  1. Request information via e-mail
  2. Contact your local Greenheck Representative
  3. Phone us at (715) 359-6171 or fax us at (715) 355-2399
  4. Write us at Greenheck, P.O. Box 410, Schofield, WI 54476-0410
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