GAS VENTILATION CALCULATOR (GB)An Easy to use App, that will calculaterequirements for Gas Appliances.Suitable for both Open Flued and Room Sealed.Suitable for appliances rated up to 70Kw.Reflects general requirements of :BS 5440-2 : 200Will Also Calculate Free Air Area for Newand existing Ventilation,To check if ventilation is suitable forthe Appliance.No need to remember any complicated formula’sor calculations.Simply enter Heat Input from rating plateof the appliance, and press Calculate.Heat Input can be entered as a grossor net value.If you like this App, Please rate it.If you would like any features added,or would like a specific app createdfor Android Market, then please emailus at [email protected].