Southwark Metal 811_25x16 Return Air Drop 25x16 Trunk 25x10

Product Description

The SOUTHWARK METAL 811_25x16 is a return air drop fitting used in residential and light commercial duct systems to transition between trunk and branch duct sections. This sheet metal component connects a 25 x 10 inch trunk duct to a 25 x 16 inch return air opening, allowing airflow to pass from the branch into the main return air trunk. Fabricated from hot dip galvanized steel, this fitting provides corrosion resistance suited to the humidity levels typically found in return air plenums and crawlspace installations. HVAC installers and sheet metal contractors install this fitting as part of a cold air return package.

This fitting is designed for return air or cold air duct applications in forced-air heating and cooling systems. It is used where a duct transition is needed between a 25 x 10 inch trunk run and a 25 x 16 inch register or plenum opening. Typical installations include residential forced-air systems where the return air trunk requires a drop to meet floor or wall return grille framing. This fitting is part of the SOUTHWARK METAL 811-series return air drop package.

Key Features

• Transitions from a 25 x 10 inch trunk duct to a 25 x 16 inch return air opening
• Hot dip galvanized steel construction for corrosion resistance in return air environments
• Sheet metal fabrication for standard duct system integration
• Designed for return air and cold air duct applications in forced-air systems
• Part of the 811-series return air drop package

Compatibility

Designed as an OEM-style sheet metal return air drop fitting for forced-air HVAC duct systems requiring a transition from a 25 x 10 inch trunk to a 25 x 16 inch return air opening.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handling unit and confirm the system is de-energized before working inside the duct system. Secure all joints with sheet metal screws and seal with approved duct mastic or foil-backed tape to maintain system static pressure. Do not modify the fitting dimensions in the field.

Technical Specifications

• Trunk Duct Size: 25 x 10 inches
• Return Air Opening Size: 25 x 16 inches
• Material: Hot Dip Galvanized Steel
• Application: Return Air / Cold Air Duct

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 811_25x16