GAS VENTILATION CALCULATOR GB

Gas ventilation calculator (gb). An Easy to use App, that will calculate. Requirements 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: 200. Will Also Calculate Free Air Area for New. And existing Ventilation, To check if ventilation is suitable for. The Appliance.