Witten Automatic Vent 306MBL Foundation Vent 8x16 Stainless Steel

Witten 306MBL Automatic Foundation Vent — 8x16, Stainless Steel

Upgrade your crawl space or foundation ventilation with a passive, no-wiring solution. The Witten 306MBL opens automatically when warm air rises and closes as temperatures cool, helping to promote air movement beneath the floor without the need for electrical hookups. This makes retrofit installations straightforward and less intrusive for most standard openings.

Designed for durability, this foundation vent combines a high-density thermo-plastic body with stainless steel internal parts. A heavy-duty aluminum mesh screens both sides to deter debris while preserving airflow, so the vent can operate in year-round weather without constant maintenance. With a net free area of 65 square inches, it maintains a balanced airflow suitable for typical 8x16 openings, supporting passive ventilation strategies without overloading your system.

How it works

Inside the vent, a simple thermal mechanism responds to ambient temperatures. When the environment reaches roughly 70°F, the vent opens to encourage cross-ventilation. As temperatures drift toward 40°F, the vent closes to help minimize temperature-driven drafts. Because there is no electrical hookup, this is a low-profile, maintenance-friendly solution that installs with standard methods.

Why you might choose this model

Whether you are replacing an aged vent or adding a new passive vent to an existing foundation, the 306MBL offers a straightforward retrofit option. Its steel and plastic construction stands up to moisture and temperature changes, while the dual-sided mesh helps keep leaves and debris out of the airflow path. The unit is backed by a 1-year warranty for安心, and the compact footprint makes it compatible with most existing 8x16 openings.

Key benefits

• Compatible with standard 8x16 foundation vent openings
• No electrical hookup required for operation
• Durable high-density thermo-plastic body with stainless steel components
• Front and back aluminum mesh for added protection against debris
• Net free air area of 65 square inches to support ventilation needs
• Retrofit-ready design that simplifies installation
• 1-year warranty for added peace of mind

Technical overview

• Size: 16 by 8 inches (foundation vent footprint)
• Material: plastic body with stainless steel parts
• Net free area: 65 sq in
• Color: black
• Mounting: automatic operation, no wiring

In short, the Witten 306MBL Foundation Vent offers a practical, maintenance-light path to improved foundation ventilation. It emphasizes passive airflow, straightforward retrofit, and durable materials to help support a balanced indoor environment without relying on electrical power.