4 in. Oval To Round Adapter Air Tight ATOSB44 - The Home Depot

IMPERIAL 4-in Plastic Oval 90 Degree Round To Oval Duct Elbow in the Duct Transitions & Connectors department at

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Selkirk 5 in. Steel Male Universal Gas Vent Adapter 105081 - The Home Depot

Everbilt 4 in. Round to Oval Dryer Duct Adapter R2OHD - The Home Depot

American Metal Products 4 in. x 7 in. Flat Oval 45-Degree Elbow 4045F - The Home Depot

Master Flow 6 in. Straight Oval-to-Round Boot OTRB6 - The Home Depot

American Metal Products 4 in. x 7 in. Flat Oval 45-Degree Elbow 4045F - The Home Depot

Master Flow 6 in. Straight Oval-to-Round Boot OTRB6 - The Home Depot

4 in. Oval To Round Adapter Air Tight ATOSB44 - The Home Depot

4 in. Oval To Round Adapter Air Tight ATOSB44 - The Home Depot

American Metal Products 4 in. x 7 in. Flat Oval 45-Degree Elbow 4045F - The Home Depot