Standards Development

Scope

This document specifies the characteristics of performance for single and multi-wall system chimneys with rigid metal liners composed of chimney sections, chimney fittings, terminals and supports with nominal diameter up to and including 1200 mm, used to convey the products of combustion from appliances to the outside atmosphere.

This document also specifies characteristics for the air supply ducts of concentric chimneys for room-sealed application, made out of metal or plastic (without fibre stabilization). Additionally, it specifies assessment and verification of constancy of performance (AVCP).

NOTE 1 Metal liners and metal connecting flue pipes, not covered, are included in prEN 1856-2:2020.

NOTE 2 This document does not apply to structurally independent chimneys.

Purpose

EN 1856-1 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 1856-1takes into consideration comments from first CEN Enquiry and HAS Consultant and it has been approved by TC 166/SC2.