We offer a wide range of Flavell Slimline Gas Fires. These Slimline class 2 gas fires are suitable for prefabricated / pre-cast flues. Prefabricated flues are easily identifiable by a metal flue and terminal on the roof and a metal flue box behind the fire. And Pre-cast flues are found in more modern homes, they’re identified by a ridge vent or metal flue on the roof. We offer a variety of different designs so you can find the one for you.