DuraVent Round Type B Gas Vent Model BV 3" x 4" Low Profile Double Wall Increaser w39.8 10" and 12" are listed

10" and 12" are listed by Underwriters Laboratories Inc

29 kW) Average Overall Efficiency (Dry Cordwood) 75 % (HHV) 80 % (LHV) Optimum Overall Efficiency  82 % Optimum Heat Transfer Efficiency 78 % Average Particulate Emissions Rate 1

75" Framing Height 16-1/2" Framing Depth 6-1/2" BTU 5

It fits snug over Rectangle fire pits & fire pit tables

Selkirk 5" x 8" Storm Collar

DuraVent Round Type B Gas Vent Model BV 3" x 4" Low Profile Double Wall Increaser w39.8 10" and 12" are listedOur 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) Low Profile Double Wall Increaser Features