Southwark Metal 35A_8IN Trunk Duct Reducer 8 in

Product Description

The SOUTHWARK METAL 35A_8IN is an 8-inch cut-in sheet metal trunk duct reducer fabricated from hot-dipped galvanized steel. It is designed to reduce the cross-section of a rectangular sheet metal trunk duct, allowing airflow to be directed and balanced across a forced-air distribution system. The cut-in design enables installation into an existing trunk run without dismantling the entire duct section. This fitting is sized at 8 inches and meets ACCA and SMACNA standards, making it suitable for new construction and retrofit HVAC ductwork projects. HVAC sheet metal mechanics and duct installers are the primary trade professionals working with this fitting.

This reducer is used in residential and light commercial forced-air HVAC systems where trunk duct sizing must be stepped down to match supply branch take-offs or to maintain proper static pressure balance throughout the distribution system. The cut-in style is commonly used during service work or phased installations where duct runs are already in place and a full-section replacement is not practical. Applications include attic, basement, and crawlspace duct systems built to SMACNA and ACCA Manual D standards.

Key Features

• Hot-dipped galvanized steel construction resists corrosion in humid or unconditioned space installations
• Cut-in design allows field installation into existing trunk duct runs
• 8-inch sizing for standard trunk duct reduction applications
• Meets ACCA and SMACNA applicable standards for sheet metal ductwork
• Suitable for new construction and retrofit HVAC duct systems

Compatibility

Designed as an OEM-style sheet metal fitting for residential and light commercial forced-air HVAC trunk duct systems requiring an 8-inch cut-in reducer.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal mechanic. The air handling system should be powered down and the supply fan stopped before cutting into or modifying an existing trunk duct. Secure the fitting with sheet metal screws and seal all joints with UL 181-listed duct mastic or approved foil tape per local mechanical code requirements. Follow SMACNA and ACCA Manual D guidelines for proper duct sizing and fitting placement.

Technical Specifications

• Material: Hot-Dipped Galvanized Steel
• Type: Cut-In
• Size: 8 inches
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 35A_8IN