Lambro Industries 604B Fixed Air Intake Louver Vent 4 in

Product Description

The LAMBRO INDUSTRIES 604B is a fixed air intake louver vent designed for residential and light-commercial ventilation applications. Constructed from brown plastic, this vent provides a dedicated intake opening for fresh air while the integrated plastic screen filter blocks debris, insects, and other contaminants from entering the duct system. Rated for a 4-inch opening, it installs directly into a wall or soffit penetration and is a standard choice for HVAC technicians and installers managing balanced ventilation, combustion air makeup, or general building ventilation.

This vent is suited for applications where a fixed, non-adjustable intake louver is required. Its brown color blends with common exterior finishes, making it appropriate for visible installations on siding, eaves, or foundation walls. The plastic screen filter is built into the assembly, reducing the need for separate filtration components at the intake point. It is commonly used in residential new construction and retrofit projects where a low-profile intake solution is needed.

Key Features

• Fixed louver design maintains consistent airflow without adjustment
• Integrated plastic screen filter blocks debris and pests at the intake
• 4-inch size fits standard duct penetrations and collar connections
• Brown plastic construction resists corrosion in exterior installations
• Sold individually for flexible installation planning

Compatibility

Designed as an OEM-style replacement or new-installation component for 4-inch fixed air intake vent applications in residential and light-commercial ventilation systems.

Installation Notes

Installation is typically performed by HVAC technicians or general contractors during rough-in or retrofit work. Shut down the associated air handling or ventilation equipment before cutting or modifying any duct penetration. Verify the wall or soffit opening is sized to accept a 4-inch vent collar and that the installation location meets local building code requirements for combustion air or fresh-air intake clearances. Secure the vent flange to the mounting surface using appropriate fasteners for the substrate material.

Technical Specifications

• Vent Size: 4 inches
• Material: Brown Plastic
• Filter Type: Plastic Screen
• Louver Style: Fixed
• Weight: 2.08 pounds
• Unit of Measure: Each
• Package Quantity: 8

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: 604B