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American Metal Products Oval Gas Vent 6.9-in x 4.5-in x 7.1-in Galvanized Steel Oval Stackhead Duct Boot in the Duct Transitions & Connectors department at Lowes.com
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DuraVent 4GWARO Aluminum 4" Inner Diameter - Type B Oval Gas Vent - Double Wall - Round-to-Oval Adapter - VentingPipe.com
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