Technical Booklet L Combustion Appliances and Fuel Storage Systems·Page 15
Definitions: Draught Break and Draught Diverter
Definitions of draught break as an opening in flues for open-flued appliances, and draught diverter as a specific type designed to prevent flue conditions from interfering with combustion performance.
Draught break – an opening formed by a factory-made component into any part of the flue serving an open-flued appliance.
Draught diverter – a form of draught break intended to prevent conditions in the main length of flue from interfering with the combustion performance of an open-flued appliance. See Diagram 1.2(a).
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet L - Combustion Appliances and Fuel Storage Systems.pdf