Alcoa Home Exteriors OCTGV18 A7 Octagon Gable Vent

18″ x 18″ 2 piece. Base is fully compatible with all siding profiles. Install the base with the siding and snap on the cover later. Ventilated opening: 10″ x 12 1 2″. Outside unit dimensions: 18″. Net free area: 50.7 sq. in. Siding receiver 5 8″ to 1 1 4″

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