Lambro Ind. 143WTP 4-Inch White Plastic Under Eave Vent with Damper and Tail Pipe

Product Purpose

The Lambro 143WTP is a 4-inch white plastic under-eave vent designed for residential attic ventilation. It features an integrated weather damper with opening and closing flaps that block rain, snow and pests while allowing airflow. A 3-inch tail pipe enables through-the-eave installation for new builds or replacement projects.

Ideal Use Cases

This vent suits homeowners and contractors needing a low-profile intake or exhaust point beneath roof eaves. It works for standard 4-inch duct connections where a gravity-operated damper is preferred. Buyers who require powered ventilation, larger duct diameters, metal construction or fire-rated assemblies should look at alternative products.

Installation Notes

Mounting requires separate screws and clamps, which are not included in the package. The low-profile design fits tight soffit spaces, but installers must ensure the tail pipe aligns cleanly through the eave cut-out. Common issues include forgetting to buy fasteners and misaligning the damper hinge, which can prevent the flaps from sealing properly.