Hart Cooley hcl3808gs Round Butterfly Damper 8 Inch

Product Description

The HART COOLEY hcl3808gs is an 8-inch round butterfly damper engineered for use with T-bar ceiling diffusers in forced-air HVAC systems. The butterfly-style blade design allows for straightforward airflow adjustment at the diffuser neck, giving installers direct control over supply air volume in individual zones or rooms. Constructed from painted steel, this damper provides durable performance in standard residential and light commercial duct systems. At 0.6125 pounds and compact enough for quick drop-in installation, it is a practical service or new-construction component handled by HVAC technicians and sheet metal contractors.

This damper is intended for round duct openings measuring 8 inches in diameter and is specifically designed to pair with T-bar grid ceiling diffusers common in suspended ceiling systems. Typical applications include residential forced-air supply runs, light commercial office spaces, and retail or hospitality environments where T-bar ceilings are standard. It fits within lay-in ceiling grid installations where volume control at individual diffuser drops is required.

Key Features

• Butterfly damper design for direct airflow volume control at the diffuser
• 8-inch round configuration sized for standard T-bar diffuser necks
• Painted steel construction for durability in conditioned-air environments
• Lightweight at 0.6125 pounds for ease of overhead installation
• Compact profile at 1.9688 inches height for tight plenum clearances
• Non-galvanized painted finish suitable for interior supply air applications

Compatibility

Designed as an OEM-style volume-control damper for 8-inch round neck T-bar ceiling diffusers in residential and light commercial forced-air supply systems.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal contractors. Shut off the air handler or furnace and confirm zero airflow before accessing the diffuser and damper assembly. The damper seats at the diffuser neck within the T-bar grid opening; verify the round duct connection is secure and the blade moves freely through its full range before restoring airflow. Follow applicable local mechanical codes and SMACNA duct construction standards for diffuser and damper installations.