Southwark Metal TD_20X12X48 Trunk Duct 20x12x48

Product Description

The SOUTHWARK METAL TD_20X12X48 is a rectangular sheet metal trunk duct section constructed from hot-dip galvanized steel for corrosion resistance in forced-air HVAC distribution systems. Measuring 20 inches by 12 inches by 48 inches, this section uses a button snap-lock seam with S-cleat and drive connection ends for secure, fieldable assembly. The cross-broken panels add rigidity to the flat faces, reducing drumming and flexing under system pressure. Licensed HVAC technicians and sheet metal workers install this duct section as part of supply or return trunk runs in residential and light commercial air distribution systems.

This trunk duct section is sized for medium-to-large trunk runs where 20-inch by 12-inch rectangular duct is specified on the mechanical drawings. It is suited for new construction and retrofit projects following ACCA Manual D duct design and SMACNA fabrication standards. The 48-inch length allows efficient coverage per section while keeping handling manageable during overhead installation. Typical applications include main supply trunk lines serving multiple branch takeoffs in forced-air heating and cooling systems.

Key Features

• Hot-dip galvanized steel construction provides corrosion resistance for long service life in conditioned-air applications
• Button snap-lock longitudinal seam creates a tight, low-leakage joint without additional sealant at the seam
• S-cleat and drive connection ends allow fast field assembly between adjacent duct sections
• Cross-broken panel faces increase structural rigidity and reduce noise under static pressure
• Fabricated to ACCA and SMACNA applicable standards for commercial and residential HVAC duct systems
• 48-inch section length balances material efficiency with practical overhead handling

Compatibility

Designed as an OEM-style rectangular trunk duct section for residential and light commercial forced-air HVAC systems requiring 20-inch by 12-inch rectangular duct per ACCA Manual D or SMACNA-compliant duct layouts.

Installation Notes

Installation should be performed by a licensed HVAC technician or journeyman sheet metal worker in accordance with SMACNA duct construction standards and applicable local mechanical codes. Shut down and lock out the air handling unit before connecting or modifying any duct section in an active system. Secure all transverse joints with the drive and S-cleat connections and seal longitudinal and end joints with UL 181-listed duct sealant or mastic per local code requirements. Support the duct at intervals specified by SMACNA hanger and support standards to prevent sag and maintain system airflow geometry.

Technical Specifications

• Material: Hot-Dip Galvanized Steel
• Width (Size A): 20 inches
• Height (Size B): 12 inches
• Length: 48 inches
• Seam Type: Button Snap-Lock
• Connection Type: S-Cleat and Drive Connection
• Panel Reinforcement: Cross Broken
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: TD_20X12X48