The Greenheck Model DFDR is a round fire damper for use in walls, floors, and partitions with fire-resistance ratings less than three hours. Dynamic-rated-fire dampers are in HVAC systems that remain operational in the event of a fire. Dampers are provided with 13.625" sleeve and two retainer plates.

The Greenheck Model DFDR is a round fire damper for use in walls, floors, and partitions with fire-resistance ratings less than three hours. Dynamic-rated-fire dampers are in HVAC systems that remain operational in the event of a fire. Dampers are provided with 13.625" sleeve and two retainer plates.

The Greenheck Model DFDR is a round fire damper for use in walls, floors, and partitions with fire-resistance ratings less than three hours. Dynamic-rated-fire dampers are in HVAC systems that remain operational in the event of a fire. Dampers are provided with 13.625" sleeve and two retainer plates.

The Greenheck Model DFDR is a round fire damper for use in walls, floors, and partitions with fire-resistance ratings less than three hours. Dynamic-rated-fire dampers are in HVAC systems that remain operational in the event of a fire. Dampers are provided with 13.625" sleeve and two retainer plates.

The Greenheck Model DFDR is a round fire damper for use in walls, floors, and partitions with fire-resistance ratings less than three hours. Dynamic-rated-fire dampers are in HVAC systems that remain operational in the event of a fire. Dampers are provided with 13.625" sleeve and two retainer plates.

Polypropylene trap designed to collect grease residue to avoid drainage onto roof surface.