 The collected gas was forced through the retort governor (recently removed for scrap) and into the foul main that runs down the back of the retort house where it was purified elsewhere on the site.Like the Horizontal Retorts, the Vertical Retort was run on Newcastle Coal imported from New South Wales.In the 1950s, modifications were made to the gasworks to allow the site to use Fingal Coal from the Fingal Valley in north east Tasmania.