Standards Development

Scope

This document specifies the characteristics of performance for rigid or flexible metal flue liners, rigid metal connecting flue pipes and their fittings used to convey the products of combustion from appliances to the outside atmosphere (including their supports) or the chimney.

This document specifies sootfire resistant flue liners, connecting flue pipes and fittings for combustion appliances burning solid, liquid and gaseous fuels and non-sootfire resistant flue liners, connecting flue pipes and fittings for combustion appliances burning liquid and gaseous fuels only.

NOTE This means that flue liners, connecting flue pipes and fittings designated "O" are not suitable for combustion appliances burning solid fuel.

Vitreous enamelled connecting flue pipes are also covered by this document.

Rigid flue liners can be used as flue liners for renovation or adaptation of existing chimneys and as flue liners of custom built chimneys.

Flexible metal flue liners described in this document are exclusively for renovation or adaptation of existing chimneys. Flexible connecting flue pipes and extensible flexible products designed to be compressed or extended along their length are excluded from the scope of this document.

Single wall and multi-wall system chimney products (chimney sections, chimney fittings and terminals, including supports) are covered by prEN 1856-1:2020, even if used as liners for existing chimneys or connecting flue pipes.

Purpose

EN 1856-2 has been under revision for the last 3 years, but unfortunately it received lack of compliance assessment from HAS Consultant at the CEN Enquiry stage. There was a need to address major changes to the previous draft, and therefore a second CEN Enquiry and additional HAS assessment is required.

Given the current timeframe, it is not possible to comply with initial scheduled deadline, and therefore deletion of previous WI and registration of new one is needed to continue with the usual procedure (see CEN/TC 166/SC2 N 922) The revised draft prEN 1856-2 takes into consideration comments from first CEN Enquiry and HAS Consultant and it has been approved by TC 166/SC2.