Southwark Metal 48_17X35 Trunk Duct Panning 17x35 in

Product Description

The SOUTHWARK METAL 48_17X35 is a single-piece sheet metal trunk duct panning section used to form the bottom closure of wood-joist return air plenums and trunk duct systems in residential and light commercial HVAC applications. Fabricated from hot-dip galvanized steel, this panning material measures 17 inches by 35 inches and meets dimensional and material standards set by ACCA and SMACNA. Sheet metal mechanics and HVAC installers use it to convert framed floor or ceiling cavities into return air pathways without fabricating a full rectangular duct enclosure. The galvanized finish resists corrosion in crawlspace and basement environments where moisture exposure is common.

This panning section is suited for new construction and retrofit installations where a joist bay or framed cavity serves as the return air chase. It fits into trunk duct systems requiring a flat pan bottom to seal against wood framing members. Installers typically fasten the panning to the bottom edges of floor joists or framing using sheet metal screws and apply mastic or foil tape at seams to maintain airtight construction per ACCA Manual D and SMACNA duct construction guidelines. Applications include single-family residential air handling systems and light commercial low-velocity return air systems.

Key Features

• Hot-dip galvanized steel construction provides corrosion resistance in humid and below-grade environments
• 17 x 35 inch dimensions suit standard joist bay and trunk duct configurations
• Complies with ACCA and SMACNA applicable standards for duct construction
• Single flat panning section simplifies field cutting and installation
• Compatible with mastic, foil tape, and mechanical fastener sealing methods

Compatibility

Designed as an OEM-style sheet metal component for use in residential and light commercial HVAC trunk duct and return air panning assemblies built to ACCA and SMACNA standards.

Installation Notes

Installation should be performed by a licensed sheet metal mechanic or HVAC technician. Shut down the air handling system before modifying any duct or panning assembly. Cut edges are sharp — use appropriate gloves and tin snips rated for galvanized steel. Seal all seams and fastener penetrations with UL 181-listed mastic or foil tape per SMACNA duct construction standards to maintain system static pressure and prevent conditioned air loss.

Technical Specifications

• Material: Hot Dip Galvanized Steel
• Size: 17 inches x 35 inches
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 48_17X35