Southwark Metal 39AL_4IN Aluminum Vent Wall Cap 4 Inch

Product Description

The SOUTHWARK METAL 39AL_4IN is an aluminum sheet metal vent wall cap with an integrated damper, designed for terminating residential and light-commercial ventilation ductwork at an exterior wall. Built to 4-inch diameter, it provides a weatherproof termination point for exhaust air while the built-in damper prevents backdrafting and outside air infiltration when the ventilation system is not running. This cap is fabricated from aluminum for corrosion resistance in outdoor-exposed applications. It is typically installed by HVAC technicians or sheet metal contractors as part of a balanced exhaust or supply ventilation system.

The 39AL_4IN suits 4-inch round duct exhaust terminations on exterior walls in residential and light-commercial construction. Common applications include bathroom exhaust fans, kitchen range hood vents, dryer vents where code permits aluminum, and whole-house ventilation system terminations. Its aluminum construction makes it a practical choice in coastal or high-humidity environments where steel caps are prone to rust. Installations must comply with local mechanical codes and manufacturer-specified duct diameter requirements.

Key Features

• Integrated damper prevents backdrafting and blocks outside air infiltration when fan is off
• Aluminum construction resists corrosion in outdoor and high-humidity environments
• 4-inch diameter fits standard residential exhaust duct runs
• Meets ACCA and SMACNA applicable standards for sheet metal ventilation components
• Exterior wall-mount design provides a clean, weather-resistant duct termination

Compatibility

Designed as an OEM-style replacement or new-installation wall cap for 4-inch round exhaust duct systems in residential and light-commercial ventilation applications.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Shut down and de-energize the connected fan or ventilation unit before beginning work on the duct termination. Seal the cap flange to the exterior wall surface with appropriate weatherproof caulk to prevent moisture intrusion, and secure the cap per local mechanical code requirements. Verify that the duct diameter and termination location comply with SMACNA guidelines and applicable local mechanical codes before final installation.

Technical Specifications

• Material: Aluminum
• Size: 4 inches
• Inclusions: Damper
• Applicable Standards: ACCA, SMACNA

Standard Information

• Brand: SOUTHWARK METAL
• Manufacturer Part Number: 39AL_4IN