What the installer needs to know about acceptable alternative methods of installing connecting flue pipes in the updated version of BS EN15287-1

Earlier this week BSI announced an important update to BS EN15287-1 that all installers need to be aware of.

“This has a considerable impact on the installation process as it increases the possible length of a connecting flue pipe and for the first time it allows the use of 90 ° swept inspection bends on solid fuel installations.”

says David Wright of Schiedel Chimney Systems, the UK’s largest manfacturer of Chimney Systems.

Up until now, the maximum length of a horizontal connecting flue pipe between a solid fuel fired appliance and a chimney has been 150mm and the use of 90 o bends has not been allowed at all.

However, with this latest update to BS EN15287-1, acceptable alternative methods have been published, which allow for an increase in the length of the horizontal connecting flue pipe to 450mm and for the use of 90 o swept inspection bends provided that the following criteria are met:-

a) The maximum length of horizontal connecting flue pipe does not exceed 450mm;
b) A Defra exempt appliance or an appliance, which is limited to burning authorised smokeless fuel only, is installed;
c) A calculation according to BS EN13384-1 has indicated safe operation of the proposed configuration, and the results of the calculation are left with the householder along with the appliance installation instructions;
d) The appliance manufacturer agrees in writing to the proposed configuration;
e) The chimney manufacturer agrees in writing to the proposed configuration;
f) The total length of single wall connecting flue pipe is not more than 1.5m;he appropriate distances to combustible materials from both the appliance and the connecting flue pipe are maintained.