An endcap is used where a standard (single skin) flue will convert to an insulated flue. In standard installations, the endcap is fitted 20-30cm below the ceiling. All our flue kits include the European CE certified Atritube flue system which is imported from Greece. All Atritube flues are made from superior 0.4mm thickness, 304 grade Stainless Steel, which is suitable to withstand long term corrosion from the harsh chemicals within the flue gases of closed combustion fireplaces. These flues are seam welded and utilise a clamp method of assembly which makes drilling and pop riveting obsolete.