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This Omega National backdraft damper is a round duct accessory designed to work with the 250 CFM blower in a wood range hood ventilation system, blocking reverse airflow when the blower is off.
When a range hood blower shuts off, an open duct creates a path for outside air to flow back into the kitchen, bringing cold drafts, odors, and humidity with it. A backdraft damper addresses this by using a flap or gravity-actuated valve that opens when the blower pushes air out and closes when airflow stops. This damper is sized at 7 inches in diameter to match the duct outlet of the 250 CFM blower used in Omega National wood hood systems.
This damper is a ductwork component, not a decorative part of the hood shell. It installs in the duct run between the blower and the exterior termination point, typically near the wall or ceiling penetration. Because it is matched to the 7-inch round duct connection of the Omega National 250 CFM blower, confirm the blower model and duct diameter before ordering to make sure the damper seats correctly in the run.
This damper is the right choice for a ducted wood range hood installation where the ventilator is an Omega National 250 CFM blower and the duct is 7-inch round. It is a single component in a complete hood system: the decorative wood shell, the ventilation insert, and the ductwork accessories each serve a distinct role, and this damper covers the backdraft-prevention function. Cabinet shops, contractors, and designers specifying a complete hood package should confirm that each piece of the system is accounted for before installation day.
It is sized and specified for the Omega National 250 CFM blower. For a different blower or a different CFM rating, confirm the duct diameter and damper spec before ordering.
No. This is the backdraft damper only. The ventilation blower and the decorative wood hood shell are separate products.
The damper installs in the duct between the blower outlet and the exterior termination, typically near the wall or ceiling penetration where the duct exits the building.
Adding this damper to the duct run closes off the system when the blower is off, keeping the kitchen comfortable and the hood performing as intended year-round.
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