1. Department of Trade and Industry; Estimates derived from UK Office for National Statistics, Future Energy Solutions and Department of Trade and Industry data, 2002. Available from: .
2. Frost free operation of large and high rise cold storage;Boast;Proc. Instit. Refrig.,2002
3. P.J.J.H. Ligtenburg, D. Wijjfels, Innovative air curtains for frozen food stores, in: Proceedings of the 19th International Congress of Refrigeration, 1995, pp. 420–437.
4. Heat transfer characteristics of the air curtain;Hayes;ASHRAE Trans.,1969
5. Design data for air curtains;Hayes;ASHRAE Trans.,1969