Gas Combustion Toolbox is a fully featured calculator that allows to: - calculate either gas flow or heat power of natural and LPG reference gases. - compare two different gases calculations either by considering the density ratio or the same power - calculate the air flow necessary to combust a given gas flow - calculate corresponding combustion parameters as CO2%, O2%, lambda. - calculate gas injector diameter or gas pressure drop - calculate the equivalent diameter of multiple gas injectors - calculations are based on UI or Imperial units (selectable) Pro version has the following additional features: - 37 natural and LPG gases are available (comprising limit gases) - the altitude influence on combustion is automatically calculated - additional custom gases can be added giving their composition; they can be saved allowing to build your own gas database. The new gas characteristics (density, low and high calorific value and wobbe index are automatically calculated)