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SHIPPING INFORMATION Delivery time in European Union: 2-7 business days; USA, Canada: 5-8 business days; other countries: 5-12 business days. The packages are shipped via FEDEX, UPS, DPD, TNT, GLS, DHL. DF AIR FORCED Gas Burner for Large Forges and Furnaces, Efficient and Economical DF AIR FORCED burner (308,000 BTU). Powerful and efficient. It is intended for large forges and furnaces. It reaches welding temperature in all large forges and melting temperature in large furnaces. It’s an excellent choice for professional use! Our nozzle design is lasting longer and increases the burner's efficiency. Burner's Nozzle is made of 304 Stainless steel (burner's nozzle at the widest place is 5cm). Its operating pressure range 1 - 25 PSI. The forced air burner runs much hotter, heats faster, and allows you to adjust air to gas ratio for optimal heat and gas usage. The forced air burner is simple, it can be hooked up to any air compressor and by opening the ball valve adjusts the air to gas ratio creating a super hot flame. It also reduced fuel consumption and heating time. Air compressor requirements: - Need 2HP power, 24 liter receiver and 100 liter per minute compressor. Our burners are manufactured for work with: Butane Propane Butane + Propane Gas LPG Our burners don't work on Natural Gas. Table explanation: ATM: Gas pressure from gas pressure regulator (in Atmospheres). 1ATM - 1.01Bar - 14.5PSI PSI: Gas pressure from gas pressure regulator (in Pounds per square inch). 1PSI - 0.06ATM - 0.068Bar BTU/Hr: British thermal unit per hour. 1 BTU/hr = 0.00029307107 kW LBS/Hr: Pounds per hour. 1 lbs = 0.45359237 kilograms Kg/Hr: Kilogram per hour. 1 kilogram = 2.20462262 lbs KW/Hr: Kilowatt per hour. 1 kW/Hr = 3412.142 BTU/Hr  DF (air forced) PSI ATM BTU/H lbs/h KW/h Kg/h 1 0,07 61.577 2,85 18,04632 1,29 2 0,14 87.083 4,03 25,52136 1,83 3 0,20 106.654 4,94 31,25715 2,24 4 0,27 123.154 5,70 36,09265 2,59 5 0,34 137.690 6,38 40,35281 2,89 6 0,41 129.284 5,99 37,88939 2,72 7 0,48 162.917 7,55 47,74609 3,42 8 0,54 174.166 8,07 51,04271 3,66 9 0,61 184.731 8,56 54,13897 3,88 10 0,68 194.723 9,02 57,06749 4,09 15 1,02 238.486 11,05 69,89311 5,01 20 1,36 275.380 12,75 80,70562 5,79 25 1,70 307.884 14,26 90,23162 6,47 30 2,04 337.270 15,62 98,84379 7,09 35 2,38 364.293 16,87 106,7635 7,65 40 2,72 389.446 18,04 114,135 8,18 Graphic explanation: BTU/Hr: burner power. PSI: gas pressure from gas pressure regulator.