This standard specifies the test gases, test pressures and categories of appliances relative to the use
of gaseous fuels of the first, second and third families. It serves as a reference document in the specific
standards for appliances that fall within the scope of the Council Directive on the approximation of the laws of
Member States concerning gas appliances (90/396/EC).
The standard makes recommendations for the use of the gases and pressures to be applied for the tests. The full
procedure will be given in the corresponding appliance standards.
NOTE The test gases and the test pressures specified in this standard are in principle intended to be used with all the
appliances in order to establish conformity with the corresponding standards.
However, the use of some test gases and test pressures may not be appropriate in the following cases:
appliances with nominal heat input greater than 300 kW;
appliances constructed on site;
appliances in which the final design is influenced by the user;
appliances constructed for use with high supply pressures (notably direct use of the saturated vapour pressure).
In these cases, the specific appliance standards may specify other test conditions in order to establish compliance with their
requirements.
BS EN 437:2003+A1:2009 Referenced Document
EN ISO 3166-1:2006 Codes for the Representation of Names of Countries and Their Subdivisions - Part 1: Country Codes*， 2024-04-19 Update
EN ISO 6976:2005 Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition*， 2005-05-01 Update
BS EN 437:2003+A1:2009 history
2021BS EN 437:2021 Test gases. Test pressures. Appliance categories