NEN EN 437 : 2003 + A1 2009

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Gases
   4.1 Classification
   4.2 Test gases
5 Test pressures
6 Classification of appliances
   6.1 Appliance categories
        6.1.1 General
        6.1.2 Category I
        6.1.3 Category II
        6.1.4 Category III
   6.2 Operations permitted for a change of gas or
        pressure, adjustment and regulating devices
7 Choice of test gases and test pressures
8 Marking
Annex A (normative) - Conditions for preparation of the test
                        gases
Annex B (informative) - National situations
      B.1 - General
      B.2 - Categories listed in the body of the standard
            marketed in the different countries
      B.3 - Appliance supply pressures corresponding to the
            categories given in B.2
      B.4 - Special categories marketed nationally or locally
      B.5 - Test gases and test pressures corresponding to
            the special categories given in B.4
      B.6 - Special conditions
Annex C (informative) - Guidelines for extension to other
                        categories
Annex D (informative) - National situation of countries whose
                        national bodies are CEN affiliate
      D.1 - General
      D.2 - Categories listed in the body of the standard
            marketed in the different countries
      D.3 - Supply pressures of the appliances
      D.4 - Special categories marketed nationally or locally
      D.5 - Gases and test pressures corresponding to
            the special categories given in D.4

Defines 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).