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Tornado dampers are designed to protect against rapid negative pressure changes caused by passing tornadoes. The HTOD-330 has a double-flanged frame with single thickness fabricated blades.

• Pressure suction with airflow - typically exhaust applications
• Pressure suction opposite airflow - typically intake applications
• Pressure: Up to 83 in. wg (20.7 kPa)
• Velocity: Up to 4000 fpm (20.3 m/s)
• Temperature: -40°F to 250°F (-40°C to 121°C)
• Pressure Rise or Decrease: 3 psi (20.7 kPa)