The Greenheck CRD-2 is a UL555C classified damper designed to limit the radiant heat transfer through an opening in the ceiling membrane of a fire-resistance rated floor/ceiling assembly of three hours or less.

The Greenheck CRD-2 is a UL555C classified damper designed to limit the radiant heat transfer through an opening in the ceiling membrane of a fire-resistance rated floor/ceiling assembly of three hours or less.

The round duct connector replaces the standard square discharge duct connector and damper. Constructed of polypropylene, Model RDC-6 includes an integral damper.

Model RDC-8, round duct connector replaces the standard square discharge duct connector and damper. Constructed of galvanized steel.

Speed controls are used for manual adjustment of the fan’s performance (for final system balancing) or to control the fan’s output in confined spaces, such as conference or meeting rooms. The fan can be adjusted to 60% of design airflow with a speed control. This reduction in airflow and fan speed is also accompanied by a reduction in noise level. Note: For use on direct drive fans with single phase, PSC or shaded pole motors.

Speed controls are used for manual adjustment of the fan’s performance (for final system balancing) or to control the fan’s output in confined spaces, such as conference or meeting rooms. The fan can be adjusted to 60% of design airflow with a speed control. This reduction in airflow and fan speed is also accompanied by a reduction in noise level. Note: For use on direct drive fans with single phase, PSC or shaded pole motors.