A wide selection of clay gas flue terminals are manufactured by WT Knowles including various inserts and single piece and 2-piece chimney pot terminals in red terracotta, buff and traditional salt-glazed.
WT Knowles already had certification for these items issued by British Gas in accordance with BS1289-2:1989 – Flue blocks and masonry terminals for gas appliances. Specification for clay flue blocks and terminals. This standard has now been withdrawn and replaced by
BS EN 13502:2002.
The company is pleased to report that its range of gas flue terminals has been type tested and certified by Advantica Certification Services in accordance with BS EN 13502:2002 – Chimneys. Requirements and test methods for clay/ceramic flue terminals.
The certification for Type 2 terminals covers the full range of 14 gas flue terminal products in red terracotta, buff and traditional salt-glazed.
The exhaustive testing programme included freeze/thaw cycles, acid resistance tests and aerodynamic behaviour.
Aerodynamic behaviour tests are carried out under wind-free and wind conditions and testing under wind conditions includes variable wind speeds and approach angles whilst maintaining internal flue flows.
Incorporated in the test programme are examinations for internal and height dimensions and squareness for the base on parallel sided flue terminals. The gas flue terminals are marked in accordance with the requirements of the standard.
Details of the range of certified gas flue terminals are available on our website including downloadable images and drawings. The drawings provide comprehensive information on dimensions, weights and markings.
Certified products
KNO180 Gas terminal
KNO180C Crowned gas terminal
KNO205 Gas Terminal
KNO205C Crowned gas terminal
KNO160SQ Square base gas terminal
KNO160SQC Square base crowned gas terminal
KNO160SQF Square base flanged gas terminal
KNO300SQ Bishop gas terminal
KNODFE4 DFE Double gas terminal
KNODFE5 DFE Double combi gas terminal
KNOLBGT Leeds bishop sit on gas terminal
KNOLBGT1 Leeds bishop with spigot gas terminal
KNOTC7 Single combi gas terminal
KNO3PB 2-piece bishop gas terminal