DuraVent Round Type B Gas Vent Model BV 18" Large Diameter Storm Collar btu30500 The AIS is used for

The AIS is used for new installations and includes a built-in drop-down joist shield

Realistic Appearance

Dripless Connection

Monessen has the answer

Model  OB36MVN Valve  Millivolt Size 36" Fuel  Natural Gas Input  60

DuraVent Round Type B Gas Vent Model BV 18" Large Diameter Storm Collar btu30500 The AIS is used forOur 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) Large Diameter Storm Collar Features Used