Lambro Industries 346S Aluminum Wall Cap 6 Inches

Product Description

The LAMBRO INDUSTRIES 346S is a 6-inch aluminum wall cap designed to terminate exhaust ductwork at an exterior wall. It includes a spring-controlled damper that closes automatically when the connected appliance is not running, blocking outside air, pests, and debris from entering the duct system. A built-in screen adds a secondary barrier against insects and small animals. The cap is constructed from aluminum for corrosion resistance in outdoor installations. HVAC technicians and sheet metal contractors install this fitting during new construction and retrofit projects where a clean, weather-resistant duct termination is required.

This wall cap is suited for residential and light-commercial exhaust applications including dryer vents, bathroom exhaust fans, kitchen range hood venting, and HRV or ERV terminations. It is designed for through-wall installation on exterior surfaces where 6-inch round duct terminates. The spring-controlled damper ensures the duct remains sealed when airflow is absent, which is important in cold climates where backdraft and freezing are concerns.

Key Features

• Spring-controlled damper closes automatically when airflow stops, preventing backdraft and outside air infiltration
• Built-in screen blocks insects, birds, and debris from entering the duct
• Aluminum construction resists corrosion for long-term exterior use
• Fits 6-inch round duct — a common size for dryer, range hood, and ventilation fan exhaust
• Sold as a single unit ready for installation

Compatibility

Designed as an OEM-style replacement or new-installation wall cap for 6-inch round exhaust duct terminations on residential and light-commercial ventilation systems.

Installation Notes

Installation is typically performed by an HVAC technician or sheet metal contractor following local mechanical code requirements. Shut off and disconnect the appliance connected to the duct before beginning any duct termination work. The cap should be sealed to the exterior wall surface with an appropriate weatherproof sealant to prevent water infiltration around the penetration. Verify that the damper swings freely and the screen is clear of obstructions after installation.

Technical Specifications

• Duct Diameter: 6 inches
• Material: Aluminum
• Damper Type: Spring-controlled
• Screen: Included
• Weight: 1.26 pounds
• Package Quantity: 1 each

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 346S