Lambro Industries 3480GNDS-11 Fresh Air Intake Vent 8 in

Product Description

The LAMBRO INDUSTRIES 3480GNDS-11 is an 8-inch galvanized steel fresh air intake vent designed for through-wall installation in residential and light commercial applications. It features an 11-inch connection collar and comes with a pre-installed screen to block rodents and insects from entering the duct system. The body is fabricated from 26-gauge galvanized steel, providing corrosion resistance and long service life. No damper is included, making this a passive intake unit. HVAC technicians and mechanical contractors install this vent where a dedicated outside air supply is required, particularly in tightly constructed or energy-efficient buildings where natural infiltration is insufficient to support combustion appliances.

This vent is used primarily in residential construction where gas-fired appliances such as furnaces, boilers, or water heaters require a dedicated combustion or dilution air supply. It is also applicable in new construction where building envelope tightness limits natural air infiltration. The wall-mount through-penetration design suits exterior walls of standard framing depth. The 11-inch tail pipe accommodates connection to round duct, allowing the installer to route fresh air to a mechanical room or air handler location. Always verify local mechanical and building code requirements before selecting vent location and sizing.

Key Features

• 8-inch diameter opening sized for standard round duct connections
• 11-inch tail pipe for flexible duct routing within the wall or chase
• 26-gauge galvanized steel construction resists corrosion in exterior wall applications
• Pre-installed screen prevents pest and debris intrusion
• No damper configuration for passive, unrestricted fresh air intake
• Through-wall design suited to residential fresh air and combustion air applications

Compatibility

Designed as an OEM-style replacement and new-installation fresh air intake vent for residential gas appliance combustion air and mechanical ventilation systems requiring an 8-inch through-wall duct connection.

Installation Notes

Installation is performed by licensed HVAC technicians or mechanical contractors in accordance with local building codes, the International Mechanical Code, and the International Fuel Gas Code where gas appliances are served. Shut down all connected HVAC and combustion equipment before cutting the wall penetration and installing the vent collar. Seal the annular gap between the vent sleeve and wall framing per local code to prevent moisture intrusion and air bypass. Consult local authority having jurisdiction for required combustion air opening sizing when this vent serves gas appliances.

Technical Specifications

• Duct Diameter: 8 inches
• Tail Pipe Length: 11 inches
• Material: 26-gauge galvanized steel
• Damper: None
• Screen: Pre-installed
• Application: Fresh air intake, through-wall

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 3480GNDS-11