Rectorseal 804-12 Round Radial Damper 12 in Galvanized

Product Description

The RECTORSEAL 804-12 is a round radial blade damper sized for 12-inch round duct connections, designed for duct-mounted airflow control in suspended ceiling HVAC systems. The radial blade configuration delivers balanced, even airflow adjustment across the diffuser inlet, supporting accurate air distribution during system balancing and commissioning. Constructed of galvanized steel, the damper resists corrosion in standard HVAC service environments. It installs upstream of compatible 2000 Series T-Bar Step Down Diffusers and provides manual airflow regulation without powered actuation. HVAC technicians and sheet metal contractors install this damper during new construction and retrofit projects.

The 804-12 is intended for use in commercial and light-commercial suspended ceiling installations where T-Bar grid systems are used. The 12-inch round duct sizing suits medium to larger supply air branches in variable or constant volume systems. It is positioned upstream of the diffuser to allow field adjustment of airflow volume during commissioning without removing the diffuser from the ceiling grid. This approach simplifies balancing on multi-zone systems where individual outlet control is required.

Key Features

• 12-inch round duct connection for standard medium and large supply branches
• Radial blade design provides balanced, even airflow adjustment across the full inlet area
• Galvanized steel construction resists corrosion in typical HVAC duct environments
• Manual operation supports airflow regulation during system balancing and commissioning
• Designed for upstream installation before 2000 Series T-Bar Step Down Diffusers in suspended ceilings

Compatibility

Designed for integration with 2000 Series T-Bar Step Down Diffusers in suspended ceiling applications using 12-inch round duct connections.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Shut down the air handling unit and verify zero airflow before installing or adjusting the damper in the duct system. Secure the damper to the duct upstream of the diffuser per local mechanical code requirements, referencing SMACNA duct construction standards as applicable. Do not overtighten fasteners on the galvanized housing, as deformation can affect blade travel and airflow calibration.

Technical Specifications

• Duct Connection Size: 12 inches round
• Blade Type: Radial
• Material: Galvanized Steel
• Operation: Manual
• Application: Suspended ceiling HVAC supply air

Standard Information

• Brand: RECTORSEAL
• Manufacturer Part Number: 804-12