Australian Tea Tree Oil in a specially formulated Gelair™ gel matrix block. The Gelair™ Air Conditioning Block is specifically designed to provide controlled and sustained release of Tea Tree Oil vapour in high volume, high flow areas such as the air handling unit (AHU) of air conditioning systems. The Gelair™ Air Conditioning Block stops the spread of invisible mould, bacteria and viruses and sterilises and sanitisers the entire air conditioning system, including both the air passing through the system and the AHU, ducts and diffusers. No installation equipment or training required. 100% natural product with no maintenance or energy costs. Available in four sizes to suit different system capacities.