This is a fitting for connecting a Gas Vent to a flue liner. The flue liner then sits in the 60mm deep socket. Distance to combustible materials: 50mm.
Designed to be secured into the top of a stainless steel flexible flue liner at the point where the liner exits an existing masonry, or similar chimney. Connection would normally be in the roof space, and the Gas Vent continues to termination in the normal manner.
Gas Vent lengths and fittings are available with the outer casing fabricated from galvanised steel. The flue liner is aluminium. Vertical seams are rolled and securely locked. The inner and outer casing are joined at one end only and a 6mm (1/4") air gap is incorporated: the inner liner is thus free to expand as the temperature changes in the vent.