DuraVent Model BV – Oval 45° Elbow – Flat The flat 45° elbow is used in pairs where offsets are desired in 1” minimum clearance enclosures or open spaces, such as attics or basements. Add pipe sections between pairs to produce additional offset. 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.
