Rigid chimney structures


The purpose of this standard is to provide the candidate with knowledge to determine the mechanical and atmospheric basis for installing a rigid chimney system.

CITB has developed this standard in discussion with industry


Minimum 1 day of 6 learning hours


The purpose of this standard is to provide the candidate with knowledge to determine the mechanical and atmospheric basis for installing a rigid chimney system.
The scope of this standard covers:

  • rigid chimneys and flues for: coal, oil, biomass, wood, and gas
  • manufacturer’s installation requirements
  • party wall requirements
  • adequate ventilation
  • low level fire risk
  • protection of buildings
  • listed properties
  • non-compatible systems
  • topography of the area
  • termination heights
  • visual impairment / blinding
  • structural support
  • volatile emissions
  • support documentation 
  • main legislation, codes of practice, building standards, and BS/EN standards, relating to the design and installation of flues, including fire, safety and environment.

Occupational relevance

Training delivered against this standard would be relevant to the following occupational groups:

  • operative and craft
  • supervision.

Candidate pre-requisites

There are no candidate pre-requisites as part of this standard. However, it would be beneficial if candidates had experience in the relative industry.


As a minimum, course instructors must be able to demonstrate that, in relation to this standard, they have:

  • a train the trainer or instructional techniques course certificate
  • successfully completed training to this standard 
  • at least 2 years relevant industrial experience
  • a verifiable CV.


The following methods may be used in the delivery of this standard:

  • classroom

All materials and equipment must be of a suitable quality and quantity for candidates to achieve learning outcomes and must comply with relevant legislation.

The class size and candidate/instructor ratio must allow training to be delivered in a safe manner and enable candidates to achieve the learning outcomes.

This standard is considered to contain 51 per cent or more theoretical learning.


For the successful completion of training, candidates must complete an end of course practical assessment or knowledge test that measures the learning outcomes and has a pass or fail criteria.

Quality assurance

Quality assurance against this standard will require initial approval of the training organisation and their content mapped to the standard. 

CITB will also conduct an approval intervention, either desk-based or centre visit, to ensure the training organisation can meet the requirements of the Training Standard. 

Approved training organisations (ATOs) will be required to present information on records of training and assessment upon request to CITB for desk-based analysis. They will also be visited annually by the CITB quality assurance team.


There are no mandatory renewal or recommended refreshment requirements for this standard.

Approval date

November 2018

Review cycle

Either on request or in 3 years from approval date.

Learning outcomes

The candidate will be able to Additional guidance to support learning outcome

Interpret the manufacturer’s installation requirements

Sample manufacturer’s documentation, and corresponding photos/videos of the installation

Describe party wall requirements

Sample case studies. Without personal information

Describe adequate ventilation


Describe low level fire risk


Describe protection of buildings


Describe listed properties


Describe non-compatible systems


Describe topography of the area


Describe termination heights


Describe visual impairment / blinding


Describe structural support


Describe volatile emissions


Describe support documentation

Use a set of documents/drawings, documents, and photos for a site scenario.

Additional information about this standard

Building regulations

The construction and installation of chimneys and flues is covered by UK building regulations in conjunction with relevant European and British standards. See relevant legislation and the NBS (originally National Building Specifications)

  • England & Wales: The building regulations approved document J
  • Scotland: Building regulations technical standards
  • Northern Ireland: Technical booklet L section 3 building regulations Northern Ireland

Statutory guidance

Building control

See Planning Portal for details of document Part L Conservation of fuel and power

  • Approved document L1A: Conservation of fuel and power in new dwellings
  • Approved document L1B: Conservation of fuel & power in existing dwellings
  • Approved document L2A: Conservation of fuel & power in new buildings other than dwellings
  • Approved document L2B: Conservation of fuel & power in existing buildings other than dwellings


See relevant government legislation

  • Clean Air Act 1956
  • The Clean Air (Height of Chimneys) (Exemption) Regulations 1969
  • Health and Safety at Work etc Act 1974
  • Provision and Use of Work Equipment Regulations 1998 (PUWER)
  • Control of Substances Hazardous to Health 2002 (COSHH)
  • Party Wall Act 1996
  • Consumer Rights Act 2016
  • Supply of Goods and Services Act 1982

Health & Safety Executive (HSE)

There is a lot of HSE information relating to chimneys and ventilation systems. Some examples are:

Fire safety

Working at height


You can see many British/European standards and codes of practice at BSI.


  • BS 1251: 1987 Specification for open fireplace components.
  • BS 5440-1: 2008 & 2:2009. Flueing and ventilation for gas appliances (70 kW net).
  • BS 6762-2:1991. Code of practice for solid fuel fired heating in park homes and caravans.
  • BS 6880. Parts 1,2&3 1988. Code of practice for low temp hot water heating systems (45kW+).
  • BS 7977-1&2: 2009 Spec’n domestic gas appliances. Radiant. Combi/gas fire/back boiler (Pt2). 
  • BS EN 483: 2000 Gas-fired central heating boilers. Type C, max 70kW. 
  • BS EN 509: 2000 Decorative fuel-effect gas appliances. 
  • BS EN 13384-1 & 2: 2015 Chimney thermal/fluid dynamic calcs for one/more heating appliances
  • BS EN 15287+A1: 2010. Design, install & commission chimneys. Non & roomsealed appliances


  • BS EN 50291-1: 2010. Domestic electrical apparatus for detecting carbon monoxide.

Chimneys and flues

  • BS 715: 2005 Specification for metal flue boxes for gas-fired appliances (max 20kW).
  • BS 4207:1989. Code of practice for monolithic linings for steel chimneys and flues.
  • BS 5854:1980. Code of practice for flues and flue structures in buildings.
  • BS 6999:1989. Specification for vitreous-enamelled low carbon steel flue pipes
  • BS 5871: Parts 1,2,3: 2005 & Part 4: 2007. Specification for installation of appliances
  • BS EN 1443: 2003. General requirements for chimneys 
  • BS EN 1856 – 1&2: 2009. Metal chimneys, products (Pt1) and liners/flues (Pt2)
  • BS EN 1857: 2010 Concrete flue liners. 
  • BS EN 1858: 2008 +A1:2011 Chimneys, components, and concrete flue blocks. 
  • BS EN 1993-3-1: 2006. Eurocode 3. Design of steel structures. Towers, masts and chimneys
  • BS EN 12446: 2011. Concrete outer wall elements.
  • BS EN 13084-1,2,4,5,6,7 2007. Free-standing chimneys. General, concrete, brick, and steel. 
  • BS EN 14241-1: 2013. Chimney elastomeric seals and sealants. 
  • BS EN 14471: 2013+A1:2015. Chimney systems with plastic flue liners. 
  • BS EN 16497-1&2: 2015. Concrete chimneys. Non-balanced (Pt1) and balanced (Pt2) flues.

Requirements and testing

  • BS EN 1457-1&2: 2012. Clay/ceramic flue liners, dry (Pt1) and wet (Pt2).
  • BS EN 1806: 2006 Clay/ceramic flue blocks for single wall chimneys.
  • BS EN 1859: 2009 +A1:2013 Metal chimney test methods. 
  • BS EN 13063-1&2:2005 & 3:2007. Clay/ceramic flue liners. Sootfire resistance. 
  • BS EN 13069: 2005. Clay/ceramic outer walls. 
  • BS EN 13216: 2004. Test methods for chimney systems. 
  • BS EN 13502: 2002. Clay/ceramic flue terminals.  
  • BS EN 14297: 2004 Freeze-thaw resistance tests for chimney products
  • BS EN 14989-1&2: 2007. Metal chimneys.
  • BS EN 16475-1,2,3,4,5,6&7. 2016/2017. Chimneys. Accessories. Silencers, Fans. Draught regulators, standstill opening devices, combi-secondary air devices. Access parts. Rain caps.