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The Crown Products Co Inc 667PCH2 Take-Off Collar, a duct adapter that transitions from square to round. This product is made of 26 gauge galvanized steel and is designed to fit 13.875 in Dia Supply Air, 13.125 in Dia Return Air, 14.125 in Supply Air, 22.125 in WD Return Air WD, and 14.125 in HT. Here are the key features:
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