DuraVent 4BVF 4'' Diameter Adjustable Roof Flashing ? Aluminum ? Type B Gas Vent Ensure a weather-tight seal for your gas vent system with the DuraVent 4BVF Adjustable Roof Flashing. Engineered for durability and leak protection, this flashing is designed for use with 4-inch diameter Type B gas vents and is ideal for roof pitches ranging from 0/12 to 6/12. The aluminum construction resists corrosion, while the outer galvanized steel layer adds additional strength. This component features double-wall construction and the DuraLock system, ensuring a secure fit and enhanced system integrity. A storm collar is required for complete installation (sold separately). UL listed for safe and reliable use with gas fuel appliances. Features Designed to weatherproof the vent pipe where it penetrates the roof Adjustable flashing accommodates roof pitches from 0/12 to 6/12 Double-wall construction with DuraLock seal system Inner pipe made of aluminum for corrosion resistance Galvanized steel outer pipe adds structural durability Suitable for Type B gas vent systems UL Listed for safety and compliance Specifications Brand Name: DuraVent Product Type: Adjustable Roof Flashing Vent Type: Type B Gas Vent Material: Aluminum (inner), Galvanized Steel (outer) Pipe Inside Diameter: 4 in. Roof Pitch Range: 0/12 to 6/12 Length: 17 in. Width: 17 in. Shape: Round Fuel Type: Gas Configuration: Flashing Certifications: UL Listed UPC: 662492171332 MPN: 4BVF Product Application Designed for use in residential or light commercial gas vent installations, the DuraVent 4BVF Adjustable Roof Flashing provides a secure and weather-resistant seal where vent pipes pass through roof structures. Ideal for standard-pitched roofs using 4-inch diameter Type B gas vents in furnaces, water heaters, or boilers.