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THIMBL WAL BVNT 5"5RV-WT *Brand Name: Selkirk *Diameter: 5 in. *Material: Aluminum/Galvanized Steel *Product Type: WallThimble *Maximum Temperature: 550 ~~F *Chimney Vent Type: Type B *Number: 5RV-WT *Adjustable: Yes *Vent Type: Type B *UL Listed: Yes *Width: 5 in. *Adjusts from 4 - 1/8 inch to 7 inch to fit thickness of wall