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The Rheia 20-01-010 is a 4" ferrule fitting that threads into the end of a duct to ensure a tight seal to the duct. This 4" ferrule twists into the end of a 4" diameter duct, using a patent-pending threaded system to ensure a near air-tight seal. Use only with Rheia-approved ducts.
The Rheia 4" ferrule threads into the end of a 4" diameter duct, ensuring a near air-tight seal. UL 181C and UL2043 certified.
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