# The Energy Efficiency (Refrigerators and Freezers) Regulations 1997, Paragraph 5


The adjusted volume (Vadj) of a refrigeration appliance shall be defined as:
Vadj=ΣVc×Wc×Fc×Cc Wc=(25-Tc)/20 where Tc is the design temperature in each compartment (in °C);
where Vc is the net volume of a given type of compartment in the appliance and Fc is a factor which equals 1.2 for no-frost compartments and 1 for other compartments;
Cc = 1 for refrigeration appliances belonging to the normal (N) and subnormal (SN) climate classes;
CC = Xc for refrigeration appliances belonging to the sub-tropical (ST) climate class;
Cc = Yc for refrigeration appliances belonging to the tropical (T) climate class.

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Source: https://www.legislation.gov.uk/uksi/1997/1941/schedule/1/paragraph/5 (the official version)
Page: https://openlegislation.uk/energy-efficiency-refrigerators-and-freezers-regulations-1997/schedule-1/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.