BS EN 437: 1994 : Specification Test gases, test pressure and categories of appliance, for gas appliances
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This standard specifies the test gases, test pressures and categories of appliance relative to the use of combustible gases of the first, second and third families.
Classification systems; Gaseous fuels; 2nd family gases; Chemical composition; Control samples; 3rd family gases; Density; Gas-powered devices; Testing conditions; Combustion; Test pressure; Gases; Fuels; Calorific value; 1st family gases; Pressure