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Natural Gas needs oxygen and a certain amount of oxygen in order to burn correctly.This app allows you to determine the amount of ventilation required for and open flue and flueless appliance.We have even included a simple conversion tool should your appliance quote the heat input in gross values.Features at a glance :Quick ready reckoner style calculatorClean and efficient interfaceCalculate ventilation for open flue appliancesCalculate ventilation for flueless appliances using 4 appliance types.Simple conversion section to convert net to gross and gross to net and also BTU/h.Quick reference glossary for the terms used in the app.Risk warning when heat input is considered too high for room area.Please note that you should always consult a heating engineer when considering the ventilation requirements for you appliance. We have taken all reasonable steps to ensure the results given in this application are accurate. If you believe there are inaccuracies in the calculations, please let us know using the support email where we would be delighted to address the issues raised.DISCLAIMER : Please seek the advice of a trained professional before carrying our any work or estimating for any work. This application generates results that act as a guide / indication only. We cannot accept liability for any loss or damage as a result of using this application and its results.