Gas Vent Wall Thimble, Type B, 4-in.

Round Gas Vent Double Wall Construction with its 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 Laboratories 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 when required by local code.
• Outer material 28 gauge galvanized steel
• Inner liner is Aluminum
• Check Appliance Installation Instructions For Details
• Industry Best Warranty Contact Selkirk For Details