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Multistack International Limited is a public company listed on the Australian Stock Exchange. Dunnair International Limited is a wholly-owned subsidiary of Multistack International.

The Multistack International Limited Group was founded in 1985. The operation includes air conditioning sales, service, and assembly organisation. Multistack supplies products to various parts of the world through its Agencies and Licencees.

The Multistack Group has a wide international network of distributors. The Group has ISO 9002 and TUV CERT quality accreditation. The revolutionary, effective and very compact Multistack modular chiller is patented and sold worldwide. It uses environmentally friendly R407C, R410 or R134A refrigerants. Research and Development have been indispensable parts of Multistack since its establishment. Dunnair organisation has been in operation for over fifty years and was acquired by Multistack International in 1995. Dunnair International Limited is based in Melbourne, primarily focusing on chiller and spare parts sale and support, where its head office directs national and international sales and distribution of all Multistack products.