507DR89 – 9” Start Collar w/ Damper

507DR89 9 Inch Start Collar with Damper is an HVAC air-distribution fitting designed to connect a compatible plenum or ductboard surface to 9-inch round ductwork. Its integrated damper provides a convenient way to adjust the airflow moving through the connected duct branch during system setup and balancing.

This start collar is identified as model 507DR89 and is manufactured from 30-gauge galvanized steel. Before ordering, verify the required duct diameter, mounting surface, available installation space, and airflow requirements of the complete HVAC system.

507DR89 9 Inch Start Collar with Damper Features

The 507DR89 9 Inch Start Collar with Damper combines a durable round duct connection and an airflow-control component in a single fitting. It creates a starting point for a 9-inch duct branch while allowing the airflow through that branch to be adjusted.

• Model number: 507DR89
• Nominal connection diameter: 9 inches
• 30-gauge galvanized steel construction
• Integrated damper for airflow adjustment
• Connects compatible round HVAC ductwork
• Suitable for compatible air-distribution systems
• Useful for new installations and replacements
• Professional installation recommended

The collar creates a transition between the primary air-distribution component and the round branch duct. Correct positioning, fastening, and sealing help create a stable connection and reduce unwanted air leakage around the opening.

Integrated Airflow Damper

The damper included with the 507DR89 9 Inch Start Collar with Damper allows airflow through the connected branch to be adjusted. This feature can assist with system balancing when different rooms or areas require different quantities of supply or return air.

A damper should not be used to compensate for incorrectly sized ductwork. The branch duct, collar, register, grille, and other fittings must be selected according to required airflow and the static-pressure limits of the HVAC system.

Damper position should be adjusted carefully during system startup or balancing. Excessive restriction can increase static pressure, reduce airflow, create unnecessary operating noise, and negatively affect comfort in the connected area.

After adjusting the damper, verify that air continues to move properly through the duct branch. Keep the adjustment mechanism accessible whenever possible so future inspections and airflow corrections can be completed without dismantling the system.

Durable Galvanized Steel Construction

The 507DR89 9 Inch Start Collar with Damper uses 30-gauge galvanized steel to create a durable round duct connection. The galvanized finish provides protection for the metal during normal HVAC installation and operating conditions.

Inspect the fitting before installation. Do not install a collar that is severely bent, damaged, corroded, or unable to maintain a secure round connection. Carefully straighten only minor shipping or handling deformation without damaging the damper mechanism.

The mounting surface must be strong enough to support the start collar and connected duct. Do not install the fitting on wet, deteriorated, or structurally weak ductboard or sheet metal.

Installing the 507DR89 Start Collar

Before installing the 507DR89 9 Inch Start Collar with Damper, verify the planned location and make sure there is enough clearance for the fitting, damper mechanism, connected duct, insulation, fasteners, and sealing materials.

Mark the opening carefully using the dimensions required by the fitting. Cut the mounting surface with tools appropriate for the material. Remove sharp edges, loose fibers, metal fragments, and other debris from the surrounding area.

Position the collar evenly in the prepared opening and secure it using fastening methods appropriate for the mounting surface. The connection should remain stable without deforming the collar or damaging the surrounding duct material.

Seal the complete perimeter using HVAC-approved mastic, sealant, or listed tape compatible with the mounting surface. An airtight connection helps prevent conditioned-air loss and reduces the possibility of unfiltered air entering a return system.

Connecting Flexible Round Duct

When connecting flexible duct to the 507DR89 9 Inch Start Collar with Damper, pull the flexible inner core completely over the round collar. Secure the core with an approved clamp, band, or fastening method and seal the inner connection.

Pull the duct insulation over the completed connection without leaving exposed gaps. Secure and seal the exterior vapor barrier around the collar according to the flexible duct manufacturer’s installation requirements.

Flexible duct should follow a smooth and direct route. Avoid excessive compression, sharp bends, twisting, unnecessary length, and unsupported sections because these conditions can increase resistance and reduce airflow through the branch.

Connecting Rigid Round Duct

When connecting rigid round duct, align the duct and collar correctly before securing the components. Use approved mechanical fasteners and seal the complete circumference of the joint with an appropriate HVAC sealing product.

Rigid duct should be independently supported. The collar and mounting surface should not carry the complete weight of long duct sections, heavy transitions, fittings, or other air-distribution components.

Inspect the inside of the connection before operating the system. Confirm that fasteners, duct edges, or excess sealant do not interfere with the movement of the integrated damper.

Airflow and Duct Sizing

A 9-inch duct connection is not suitable for every HVAC application. The required diameter depends on airflow demand, duct length, number of elbows, fitting resistance, blower performance, system static pressure, and the requirements of the connected room or area.

The 507DR89 9 Inch Start Collar with Damper should be selected as part of a complete duct design. Do not determine compatibility only by comparing the collar diameter with existing ductwork.

A qualified HVAC professional can calculate the required airflow and determine whether a 9-inch branch is appropriate. The technician can also adjust the damper while measuring airflow and system static pressure.

Inspection and Maintenance

Inspect the fitting during routine HVAC maintenance. Check for loose connections, damaged mounting surfaces, deteriorated sealant, air leakage, unusual vibration, corrosion, and obstructions around the damper.

Whistling, rattling, or excessive airflow noise may indicate an air leak, restriction, incorrect damper position, loose fitting, or duct-sizing problem. Evaluate the complete branch before making additional adjustments.

Professional Installation Recommended

Professional installation of the 507DR89 9 Inch Start Collar with Damper is recommended. Correct placement, fastening, sealing, support, duct sizing, and damper adjustment are essential for dependable airflow and HVAC performance.

This product includes the start collar and integrated damper. Flexible duct, rigid duct, clamps, fasteners, sealants, insulation, supports, and other installation materials may be sold separately. Confirm all required components before ordering.

Browse additional fittings and air-distribution products in the Xpress Supply Ducting & Venting category. For general heating, cooling, and energy-efficiency information, visit the U.S. Department of Energy Energy Saver.