Brand Name: Selkirk
*Diameter: 4 in.
*Material: Galvanized Steel
*Product Type: Wall Thimble
*Chimney Vent Type: Type B
*Maximum Temperature: 550 deg. F
*UL Listed: Yes
*Adjustable: Yes
*Width: 4 in.
*Number: 4RV-WT
*Vent Type: Type B