DIBD2-3

DIBD2 fire dampers can be installed vertically in walls or horizontally in floors with fire resistance ratings of less than 3 hours. The DIBD2 carries a 11/2 hour UL fire damper label and is classified as a dynamic damper for use in HVAC systems that remain in operation during a fire.
DIBD23 fire dampers can be installed vertically in walls or horizontally in floors with fire resistance ratings of 3 hours or more. The DIBD23 carries a 3 hour UL fire damper label and are classified as a dynamic damper for use in HVAC systems that remain in operation during a fire.

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