LOW-PRESSURE SERIES TORCH BURNERS are made up of Lojectors, lever-handled gas cocks, AN Burner nozzles, mounting cages, pilots and blocks in cast iron holders, and assembled as required. They are designed for low pressure gas at normal city pressures. Because they depend mainly on draft for most of the combustion air required, their capacity can only be increased by increasing the draft through the burners. The Multiplier Table for Capacity Table No. 1 on Pages 4 & 5 of the PDF (lower left banner), shows how much gas can be burned at drafts other than 0.1'' W. C. To obtain the increased capacities, the gas orifice must be enlarged or, in some cases, removed altogether. Valves and lead-in pipes may also have to be enlarged. CAPACITY TABLE Torch Size 1000 BTU/HR 0.1 DRAFT Approximate Based on Gas Pressures* shown below Flame Length Minimum Maximum Inches Kind of Gas Btu/cf Gas Pressure 6 40 65 12 - 18 Manufactured Gas 450/600 Btu/cf 3" - 12" W.C. 8 70 95 14 - 24 10 100 135 16 - 28 Mixed Gas 650/850 Btu/cf 4" - 12" W.C. 12 (A cage) 140 165 18 - 32 12 (B cage) 160 175 18 - 36 Natural Gas 900/1150 Btu/cf 5" - 12" W.C. 16 200 280 20 - 40 20 300 400 22 - 44 24 450 600 24 - 48 Propane 2500 Btu/cf 11" - 15" W.C. 321 650 800 26 - 52 322 850 1,000 28 - 56 Butane 3200 Btu/cf 11" - 15" W.C. 323 1,000 1,200 30 - 60 481 1,300 1,400 32 - 64 482 1,600 1,700 34 - 68 483 1,900 2,000 36 - 72 484 2,200 2,300 38 - 76 485 2,500 2,600 40 - 80