GB Gas Purging Calculator
Work out gas purging volumes. under IGE/UP1b Domestic installers can work on pipes up to and including 35mm or 1 1/4" and meters up to 16 m3/hr volume...
GB-GAS.CO.UK
GB Gas Heat Input Calculator
A simple heat input and gas rate calculator for timing Natural Gas installations. Time the Metric meter for two minutes, input the first and second re...