Selkirk Wall Thimble 6 " Type B

6", 6RV-WT, Wall Thimble, Adjusts 4-1/8" To 7" To Fit Wall Thickness, Round Type B Gas Vent. Round Gas Vent Double Wall Constrution with it's built-in air space, provides permanent insulation and keeps the inner pipe hot and outer relatively cool Adjusts from 4-1/8 inches to 7 inches to fit thickness of wall Used to ensure clearance to combustibles is maintained and also serves as a firestop Underwriters Labotories UL 441 and National Fire Protection Agency NFPA 54 and NFPA 211 Venting gas fired appliances, water heaters, furnaces, stoves, etc. LockTab-An alternative method to secure pipe wheen required by local code. Outer material 28 gauge galvinized steel Inner liner is Aluminum Check Appliance Installation Instructions For Details Industry Best Warrantty Contact Selkirk For Details