Hart and Cooley 3800-09-01 9 Inch Diffuser Butterfly Damper 3800 Series

Product Description

The Hart and Cooley 3800-09-01 is a 9 inch diffuser butterfly damper designed for use in residential and light commercial HVAC air distribution systems. This component belongs to the 3800 Series product line and is a genuine OEM replacement part, manufactured to the original factory specifications. HVAC technicians and installers rely on butterfly dampers to regulate and control airflow within supply air duct systems. The damper is installed behind or within a ceiling or wall diffuser and allows the technician to adjust the volume of conditioned air delivered to a given space. This makes the 3800-09-01 an essential component when balancing airflow across multiple zones or individual rooms in a forced-air system. The 9 inch size fits diffusers with a 9 inch neck or collar opening, which is a common dimension found in medium to larger residential installations and light commercial projects. Proper airflow control is critical to system efficiency, occupant comfort, and maintaining correct static pressure throughout the duct network. A butterfly damper operates with a flat blade that pivots on a central axis. When the blade is parallel to the airflow path, the damper is fully open. When rotated perpendicular, it restricts or fully blocks airflow. This simple and reliable mechanism requires minimal maintenance and provides durable, long-term performance in typical HVAC environments. HVAC service professionals, mechanical contractors, and building maintenance technicians frequently stock diffuser dampers as replacement parts to restore full functionality to air distribution systems when existing dampers become worn, bent, or stuck. The Hart and Cooley 3800 Series is a well-recognized product line in the HVAC supply industry, known for compatibility with standard diffuser and register assemblies. This part ships in original Hart and Cooley factory packaging and arrives brand new. It is a direct OEM replacement, which means no modification is required for proper fit and function in compatible systems. Contractors looking for a reliable diffuser butterfly damper for 9 inch applications will find this part meets standard installation requirements.

• 9 inch butterfly damper sized for use with compatible 3800 Series diffusers and standard 9 inch collar openings
• Genuine OEM Hart and Cooley replacement part, supplied in original factory packaging
• Pivot-blade design provides reliable, adjustable airflow control for HVAC air distribution balancing

Product Highlights

The Hart and Cooley 3800-09-01 diffuser butterfly damper is a genuine OEM component built for accurate airflow control in 9 inch diffuser applications. It is a direct replacement part that installs without modification in compatible 3800 Series assemblies.

Product Information

Standard Information

• Brand: HART AND COOLEY
• Manufacturer Part Number: 3800-09-01

Technical Specifications

• Series: 3800
• Damper Type: Butterfly Damper
• Application: Diffuser Airflow Control
• Neck Size: 9 inches
• Condition: Brand New