Lambro Industries OLD143W Dryer Vent Damper 4 Inch

Product Description

The LAMBRO INDUSTRIES OLD143W is a 4-inch white plastic soffit exhaust dryer vent damper designed to seal the vent opening when the dryer is not running. The damper closes automatically to block outside air, wind, pests, and moisture from entering the duct system. When the dryer operates, exhaust pressure pushes the damper open to allow airflow to exit freely. This component is installed in soffit-mounted dryer exhaust terminations and is suited for residential laundry applications. HVAC technicians and appliance installers typically handle this fitting as part of a new vent installation or a worn-damper replacement.

The OLD143W fits soffit exhaust terminations on 4-inch dryer vent systems in residential construction. It serves as a replacement for the Lambro 143W damper component, making it a direct-fit option for existing installations that use that configuration. Typical installations include under-eave soffit locations where the dryer exhaust duct terminates horizontally through the soffit panel. The white finish blends with standard painted or vinyl soffit materials.

Key Features

• 4-inch duct diameter matches standard residential dryer exhaust sizing
• Automatic damper closes when dryer is off, blocking backdraft and outside air intrusion
• White plastic construction resists moisture and is compatible with painted or vinyl soffit panels
• Designed for soffit exhaust termination — suitable for under-eave installation locations
• Serves as a direct replacement for the Lambro 143W damper

Compatibility

Designed as a replacement for the Lambro 143W soffit exhaust dryer vent damper. Fits 4-inch dryer exhaust duct terminations in residential soffit applications.

Installation Notes

Installation is typically performed by an HVAC technician or experienced installer. Disconnect and lock out the dryer before working on the vent termination. Ensure the soffit opening is clear and that the duct connection is properly sealed to prevent exhaust leakage into the wall or attic cavity. Local mechanical codes, including IRC Section M1502, govern dryer exhaust duct termination requirements and should be consulted before installation.

Technical Specifications

• Duct Diameter: 4 inches
• Color: White
• Material: Plastic
• Termination Type: Soffit exhaust

Standard Information

• Brand: LAMBRO INDUSTRIES
• Manufacturer Part Number: OLD143W