DuraVent Round Type B Gas Vent Model BV 4" x 5" Increaser w4 Model S20i Firebox Height 20

Model S20i Firebox Height 20

Natural gas to propane

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Model 10MF Application For use with category I natural gas-burning or propane-fired appliances such as gas boilers

DuraVent Round Type B Gas Vent Model BV 4" x 5" Increaser w4 Model S20i Firebox Height 20Our 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. What's Included (1) Increaser Features Use to increase vent