Gozney | Dome Flue ExtensionClear the Air with Flue Extension The Gozney Dome Flue Extension is the perfect companion for not only wood fired cooking and channelling away smoke & soot from the oven, but also for improving air flow. Another use of flue extension is as a means to draw emissions from the oven chamber. In addition, it has a longer flue results in a better draw of emissions from the oven. This also reduces the soot build up on the outside of the oven when cooking