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The Crown Products Co Inc 667PCH9 Square to Round Adaptors, Duct Adapter. This product is designed to provide a secure connection between square and round ducts. It is made of galvanized steel with a 26 gauge thickness. The dimensions are 16 1/8" X 18" with 13 7/8" collar for supply air and 16 1/8" X 18 1/8" with 13 7/8" collar for return air.
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