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The NUTONE 463B duct increaser is designed to fit with fan duct connector assemblies. It is designed to work with 4 inch round duct systems and is UL 94 compliant for flammability. It is used to expand a 3-inch duct to a 4-inch duct.
The Nutone 463B duct expander expands a 3-inch duct to a 4-inch duct.
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