4" Fresh Air Intake w/ Airtight Damper - AC01347

The AC01347 Fresh Air Intake Register with Airtight Damper is a 4‑inch diameter accessory designed to prevent cold drafts and improve the efficiency of wood or pellet heating appliances. Built with a sturdy steel mechanism, it allows you to manually open or tightly close the fresh air supply, reducing heat loss when the appliance is not in use. Its integrated positioning shim ensures precise installation based on wall thickness, making it a reliable solution for controlling outside air flow in certified heating systems.