Hello again bob12,
I was not suggesting that You would use the ratios that you asked about to falsify any Gas Appliance documentation.
Having since seen Member Shaun`s reply to you I did think when writing my previous message to ask you what you wanted the figures for - BUT - I thought that Members & Moderators would `jump all over both of Us` while stating something similar to what I wrote above !
I hope that You will take my message in the way that it was intended - to explain why We could not supply the information that you asked for in an `Open Forum` - as there could easily be other readers / non Gas Safe people who would use the figures for the wrong purposes.
Chris