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DuraVent Model BV – Oval Adjustable Roof Flashing Flat to 5/12 The flashing is installed either parallel or perpendicular to the roof ridge, and fits roof pitches flat to 5/12. Overview Model BV Our non-positional lock system on the Duravent® BV Gas Vent is the best lock system on the market today. The incorporation of the DuraTab® feature simply improves our lock system by adding flexibility and meeting market needs. The BV line of Duravent round vent pipe and fittings is designed for use on approved gas appliances in residential and light commercial and industrial applications.