UNI EN 437 : 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.1 and 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 members
   D.1 General
   D.2 Categories listed in the body of the standard and
       marketed in the different countries
Bibliography

Describes the test gases, test pressures and categories of appliances relative to the use of gaseous fuels of the first, second and third families.