Southwark Metal 51F_4X12X7 Straight Sheet Metal Boot 4x12x7

Product Description

The SOUTHWARK METAL 51F_4X12X7 is a straight sheet metal boot with flange, designed to transition from rectangular duct to a round collar in residential and light commercial HVAC duct systems. This fitting measures 4 inches by 12 inches on the rectangular end and 7 inches in diameter on the round outlet. Constructed from hot-dip galvanized steel, it delivers corrosion resistance suited to supply air applications. HVAC installers and sheet metal contractors use this boot where a flush ceiling register connection is required, with the integrated flange providing a clean, secure surface mount against drywall or plaster.

This straight boot is used in ceiling supply air applications where rectangular trunk duct or branch duct transitions to a round collar feeding a register or diffuser. The 4 x 12 inch rectangular opening accommodates standard residential supply branch sizing, while the 7-inch round outlet connects to flexible or rigid round duct. It is appropriate for both new construction and retrofit installations in forced-air heating and cooling systems.

Key Features

• Hot-dip galvanized steel construction for corrosion resistance in conditioned air systems
• Integrated flange for flush ceiling register mounting
• Straight boot configuration for direct in-line rectangular-to-round transitions
• 4 inch by 12 inch rectangular inlet to 7 inch diameter round outlet
• Meets ACCA and SMACNA applicable standards for sheet metal duct fittings

Compatibility

Designed as an OEM-style replacement and new-installation fitting for ceiling supply air duct systems requiring a straight rectangular-to-round boot with flange at the 4 x 12 x 7 inch size configuration.

Installation Notes

Installation should be performed by a licensed HVAC technician or sheet metal contractor in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handling system before connecting or sealing any duct fittings. Seal all joints with listed duct sealant or UL 181-rated tape to meet code requirements. Secure the flange to the ceiling surface with appropriate fasteners before attaching the register or diffuser.

Technical Specifications

• Material: Hot-Dip Galvanized Steel
• Type: Straight Boot
• Application: Ceiling
• Rectangular Inlet Size: 4 inches x 12 inches
• Round Outlet Diameter: 7 inches
• Inclusions: Flange
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 51F_4X12X7