Builders Best 100110812 Mini Louver Fresh Air Intake 4 in

Product Description

The BUILDERS BEST 100110812 is a 4-inch mini louver fresh air intake designed for residential ventilation applications. This compact white louver mounts to an exterior wall or panel to allow controlled fresh air entry into a structure. The louvered face restricts backflow and helps keep out debris, pests, and weather. Licensed HVAC technicians and general contractors install this fitting as part of combustion air, makeup air, or passive ventilation systems. Its small footprint makes it well suited for tight installations where a standard full-size louver will not fit.

This intake is used in residential and light commercial settings where a 4-inch duct opening requires a finished, louvered termination on the intake side. Typical applications include fresh air supply for gas appliance combustion air makeup, bathroom or utility room passive ventilation, and general wall penetration finishing. The white finish blends with standard exterior siding and trim.

Key Features

• 4-inch diameter opening fits standard 4-inch duct runs
• Louvered face restricts backflow and blocks debris entry
• White finish for clean exterior appearance on light-colored siding
• Compact mini profile suited for space-restricted installation locations
• Functions as a fresh air intake termination for passive or assisted ventilation systems

Compatibility

Designed as an OEM-style fresh air intake termination fitting for residential and light commercial ventilation duct systems using 4-inch round duct.

Installation Notes

Installation is typically performed by a licensed HVAC technician or contractor in accordance with local mechanical codes and IFGC requirements for combustion air and ventilation. Power down or shut off any associated mechanical ventilation equipment before cutting the wall penetration or connecting ductwork. Seal the perimeter of the louver flange with an appropriate exterior caulk to prevent air and moisture infiltration. Do not install in a location subject to direct water intrusion or where the louver face will be obstructed.

Technical Specifications

• Duct Diameter: 4 inches
• Color: White
• UPC: 722048108127

Standard Information

• Brand: BUILDERS BEST
• Manufacturer Part Number: 100110812