This solid fuel turbojet engine model is specifically designed for long-term operation in challenging environmental conditions, and the forced air supply unit can be powered by any external power source with a voltage of 3-6V, which has a USB output.   The Airwood Heavy Duty USB-h BM camping stove will be a reliable companion for travelers who enjoy long trips (a month or more) in a marine, tropical climate, or in other aggressive environments for metal products. All connections of the utensil stand and combustion chamber are made with stainless steel fasteners. All the most vulnerable parts of the stove are made of highly corrosion-resistant stainless steel! The forced air supply unit of the Airwood Heavy Duty USB-h BM stove can be powered by a Power Bank, Power Box BM power module, solar panel with built-in battery, smartphone connected via OTG cable, or any other external power source with a constant voltage of 3-6V that has a USB output or a 0.22 inches x 0.08 inches DC plug.  Thanks to the air injection block, the burner provides powerful heating even when using raw wood and quickly brings the water capacity to a boil. The boiling time of 0.26 gallons of water is from 5 minutes, depending on the quality of the fuel and the surrounding environment.   The burner has a fuel combustion efficiency of up to 80%, unlike the 5-7% efficiency of regular bonfires. This is because about 90% of the particles in the smoke from the wood are unburned due to lack of oxygen. When fresh air is injected into certain parts of the burner combustion chamber, these fine particles burn. This is the principle behind this burner: cold air from the injection block enters the side hole at the bottom of the outer wall of the burner housing. Under the action of the fan, one part of the air is injected into the holes in the bottom and lower part of the combustion chamber, while the other is directed upward between the walls of the combustion chamber and the housing, where it is heated and exits through special holes, entering the upper part of the combustion chamber and igniting the wood gas.   Where the air exits, intense flames are formed due to oxygen enrichment.  The burner can be used to cook food (soup, porridge, tea, etc.) with a volume of up to 0.79-1.06 gallons without any effort.  Branches, twigs, bark, and any other readily available solid fuel are used as fuel.   The air supply (blower) block for the combustion chamber is equipped with a DC input connector (socket) (0.22 inches * 0.08 inches.) with a hinged cap-plug to protect the connector from contamination, and a switch with the following modes: Upper position - "High speed" - for instant ignition and water boiling, Lower position - "Low speed" - to maintain high-temperature flames.  The current consumed by the blower block depends on the voltage of the power supply: • in "High speed" mode: 70-100mA; • in "Low speed" mode: 20-50mA;   In the air compressor unit, there is an engine with thermal radiation and dust-humidity protection at the IP55 protection level. This improvement allows the owner of the burner to use it in conditions of high humidity or dustiness (tropics, rain, desert, beach, etc.) without fear that the engine will fail at the most inappropriate moment.   The burner also operates in natural draft mode, for which it is sufficient to disconnect  the air compressor unit from the burner body. This mode is suitable for cooking dishes that do not require a strong flame, such as porridge.   The burner comes with a folding stand for cookware. This burner component has increased heat resistance and is specially designed for more reliable placement of round pots (pans) with a wide bottom on the burner. However, the stand will also be useful for fans of morning coffee in nature, prepared in a Turkish coffee pot (a dish with a small bottom diameter), because thanks to the folding legs, the stand will be "convenient" for dishes with a bottom diameter of 1.97 inches and 9.84 inches.!   After unfolding, the legs are fixed at a small angle to the horizon, ensuring reliable grip of the dish's bottom. When the load increases, the legs take a horizontal position, and the upper part of the stand's canvas diverges slightly outward around the entire circle, increasing the rigidity of the stand and the stability of the dish on it.   The new combustion chamber installed in the burner is significantly different from the old version: the quantity, diameter, and configuration of the air injection holes have been changed to improve the quality of the burning of the wood in the lower part of the chamber. These changes have eliminated the problem of clogging the chamber with smoldering coal and improved the burning of raw wood, thereby maximizing the adaptation of the burner to real field conditions, where dry wood is rare. In addition, the new version of the chamber ensures stable fuel burning in natural draft mode (with the booster disconnected from the burner) - this feature is very important for cooking dishes that do not require intense flame.   In this burner model, the combustion chamber has thicker walls and a larger volume compared to the chamber of the classic "Airwood BM" series turbo-burners. All chamber elements are made of highly corrosion-resistant stainless steel. The combustion chamber is assembled with the body in a rigid screw connection with the standard dimensions for the "Airwood BM" series turbo-burners.   The outer casing of the "Airwood Heavy Duty USB-h BM" burner has a closed bottom, which creates a sealed space between the two walls of the burner (between the combustion chamber and the casing), ensuring that all air from the air supply unit is directed into the combustion chamber. This means that there is no need to search for a flat surface to place the burner on, as it can even be used in a suspended state! Another advantage of the burner with a closed bottom casing is that after use on the ground, there are no burn marks left behind like with a bonfire. The bottom of this model is made of highly corrosion-resistant stainless steel.  To remove the ashes after use (once the burner has cooled), it is sufficient to remove the cooking stand and air supply unit from the burner and shake out the ashes from the combustion chamber by turning the burner upside down. Any remaining ash between the combustion chamber and the casing can easily be shaken out through the large opening on the side of the casing, to which the air supply unit is attached during burner operation.   In this model of the burner, the housing is equipped with a removable handle-holder that allows you to adjust the position or move the burner during its operation (burning). This feature will come in handy in case of sudden weather changes - you can quickly and safely move the burner to a more protected place in case of sudden rain or gusts of wind. Features: Metal material: stainless steel of various grades and thicknesses (0.01 in-0.03 in); Combustion chamber: resource: from 800 hours of burner operation depending on storage and operation conditions; volume 830ml; Dimensions: in the package: height 5.3 inches, diameter 4.7 inches; during use: height 6.9 inches, diameter from 4.7 inches to 6.3 inches; Total weight of the burner together with the cover, handle holder, and USB-DC cable - 1.2 lbs.  Package includes: 1.Burner housing assembled with bottom and high corrosion-resistant combustion chamber; 2. Reinforced heat-resistant folding stand for cookware; 3. Air supply unit with speed switch and DC connector 0.22 inches x 0.08 inches; 4. Detachable burner handle-grip; 5. USB-DC cable; 6. Strong waterproof "Oxford" fabric cover; 7. Instructions for use.