I.S. EN 621:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Construction and design requirements
6 Operational requirements
7 Test methods
8 Marking and instructions
9 Evaluation of POCED conformity and their associated
  terminals
Annex A (informative) - National situations
Annex B (informative) - Equivalence rules
Annex C (informative) - Facilities for commissioning and
                        testing
Annex D (informative) - Identification of gas types in use
                        in various countries
Annex E (informative) - A-deviations
Annex F (normative) - Special national conditions
Annex G (informative) - National solutions for countries whose
                        national bodies are Affiliate Members
                        of CEN
Annex H (informative) - Calculation of conversions of No[x]
Annex I (informative) - An example of a sampling plan
Annex ZA (informative) - Relationship between this European
                         Standard and the Essential Requirements
                         of EU Directive 90/396/EEC
Annex ZB (informative) - Clauses of this European Standard
                         addressing the provisions of the
                         EU Construction Products Directive
Bibliography

Describes the requirements and test methods for the safety and efficiency of nondomestic gas-fired air heaters not exceeding a net heat input of 300 kW with (an) atmospheric burner(s) and without a fan to assist the transportation of combustion air and/or flue gases.