16” Start Collar w/ Damper

507DR816 16 Inch Start Collar with Damper provides a practical connection between compatible ductboard plenums and 16-inch round HVAC ductwork. Its integrated damper allows the airflow passing through the branch connection to be adjusted during installation or system balancing.

Constructed from 28-gauge galvanized steel, this start collar is designed to provide a durable connection for residential heating and cooling air-distribution systems. The collar is compatible with 1.5-inch and 2-inch ductboard and can be used with appropriately sized flexible or rigid round duct.

507DR816 16 Inch Start Collar with Damper Features

• Nominal 16-inch round duct connection
• Integrated damper for airflow adjustment
• Durable 28-gauge galvanized steel construction
• Compatible with 1.5-inch and 2-inch ductboard
• Suitable for supply or return duct applications when properly sized
• Designed for residential HVAC air-distribution systems
• Compatible with properly sized round flexible or rigid ductwork

Integrated Airflow Damper

The built-in damper provides a convenient way to adjust the amount of air entering the connected duct run. This can help an HVAC technician balance the airflow between different branches of a properly designed duct system.

The damper should be adjusted according to the airflow requirements of the room or zone served by the branch. Restricting airflow excessively may increase static pressure and reduce system performance, so final adjustment should be completed by a qualified HVAC professional.

28-Gauge Galvanized Steel Construction

The 507DR816 16 Inch Start Collar with Damper is manufactured from 28-gauge galvanized steel. This material offers dependable rigidity and corrosion resistance for standard indoor HVAC installations.

Galvanized steel also creates a solid surface for fastening and sealing the connection. Proper mechanical fasteners, approved HVAC sealant and suitable duct tape should be selected according to the duct system and applicable installation requirements.

Designed for Compatible Ductboard

This start collar is compatible with 1.5-inch and 2-inch ductboard. It creates an opening that allows a 16-inch round duct branch to connect to a ductboard plenum or trunk line.

Before cutting the ductboard, verify the required location and confirm that sufficient clearance is available for the collar, damper handle and connected duct. Careful placement helps create a secure connection and provides access for future inspection.

Installing the 507DR816 Start Collar

Installation begins by marking the correct opening on the ductboard. The opening should be cut carefully so the collar fits securely without leaving unnecessary gaps around its perimeter.

After positioning the 507DR816 16 Inch Start Collar with Damper, secure it using installation methods appropriate for the ductboard. Seal the complete perimeter with an approved HVAC sealant to help prevent conditioned-air leakage.

The damper handle must remain accessible after installation. This allows the airflow to be adjusted during system commissioning and makes future inspection or balancing easier.

Connecting Flexible Round Duct

When connecting insulated flexible duct, attach the inner duct liner securely to the collar. Seal the inner connection before positioning and securing the insulation and outer vapor barrier.

Avoid compressing, twisting or sharply bending the flexible duct. Poor routing can restrict airflow and increase resistance even when a correctly sized 507DR816 16 Inch Start Collar with Damper is installed.

Connecting Rigid Round Duct

The collar may also connect to compatible 16-inch rigid round ductwork. The joint should be mechanically secured and sealed using materials approved for HVAC duct systems.

Rigid duct should be properly supported so its weight does not place excessive stress on the collar or ductboard. Support spacing and sealing methods should follow local requirements and accepted HVAC installation practices.

Airflow and Duct Sizing

A 16-inch duct connection does not automatically guarantee the correct airflow for every HVAC system. Required duct size depends on the equipment capacity, available static pressure, duct length, fittings and airflow requirements of the conditioned space.

A qualified HVAC technician should verify that the start collar and connected duct are appropriate for the system. Correct sizing can help support balanced airflow, efficient operation and consistent indoor comfort.

Inspection and Maintenance

Periodically inspect the connection for loose fasteners, damaged sealing materials or visible air leakage. The damper should remain accessible and should move correctly when airflow adjustments are required.

If airflow becomes weak or uneven, have the duct system evaluated for restrictions, leakage, improper sizing or damper position before changing equipment settings.

Professional Installation Recommended

Professional installation is recommended for the 507DR816 16 Inch Start Collar with Damper. An HVAC technician can determine the correct location, secure and seal the connection, and adjust the damper according to the system’s airflow requirements.

Explore additional HVAC ducting and venting supplies from Xpress AC Supply. For general information about efficient heating, cooling and duct systems, visit the U.S. Department of Energy Energy Saver.