BS EN 1749:2020,Classification of gas appliances according to the method of supplying combustion air and of evacuation of the combustion products (types).
This document supersedes CEN/TR 1749: 2014
The main changes compared to the previous edition are listed below:
—editorial changes, a reviewed wording and a reviewed structure compared to the TR version (CEN/TR1749:2014)；
—some technical items generally described in the foreword of the former TR are now included in the scope or in other clauses of the standard (1; 4. 1; 4.4)；
—a clause on normative references has been included (Clause 2);
—a clause on terms and definitions has been included (Clause 3)；
—examples of reworded clauses.
BS EN 1749:2020 has been prepared to provide reference scheme for classification of gas appliances to CEN Technical Committees who are preparing European Standards for appliances burning combustiblegases.
The main purpose of BS EN 1749:2020 is to promote harmonization in the classification of appliance types.This should ensure that there is a clear understanding of the various appliance types and will avoid confusion arising from Technical Committees describing them in different ways. CEN Technical Committees are therefore requested to use this document as reference in all circumstances in which it is appropriate. They should not deviate from it unless there are relevant technical reasons for doing so.
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