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BS 5440-1:2023 Chimneys, flue pipes and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases) - Design, installation, commissioning and maintenance of chimneys. Specification, 2023
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Competence
- 5 General [Go to Page]
- 5.1 Compatibility of appliances and chimneys
- 5.2 Chimney outlets
- 5.3 Chimneys for use with condensing appliances (open-flued and room-sealed)
- 5.4 Location of appliances
- 5.5 Passive stack ventilation
- 5.6 Exchange of information and planning
- 5.7 Maintenance
- 6 Room-sealed natural draught chimney configurations (balanced flue) for Type C11 appliances [Go to Page]
- 6.1 General
- 6.2 Installation
- 6.3 Post-installation checks
- 6.4 Maintenance
- 7 Room-sealed: fanned draught chimney configurations for balanced flue (Type C12, C13, C32 and C33) and non-balanced flue (Type C52, C53, C62 and C63) appliances [Go to Page]
- 7.1 Design options
- 7.2 Installation
- 7.3 Post-installation checks
- 7.4 Maintenance
- 8 Balanced compartment [Go to Page]
- 8.1 General
- Figure 1 — Balanced compartment installations
- 8.2 Design
- 8.3 Balanced compartment construction
- 8.4 Temperature effects
- 8.5 Terminals
- 8.6 Commissioning
- 8.7 Maintenance
- 9 Room-sealed Type C2 for SE-ducts and U-ducts [Go to Page]
- 9.1 Selection and installation of a suitable chimney
- Table 1 — Normal SE-duct block sizes in existing buildings
- Figure 2 — Shared room-sealed systems
- Figure 3 — Base of communal flue system – naturally vented
- Figure 4 — Base of positive pressure communal flue system
- 9.2 Terminal design and location
- 9.3 Inspection
- 9.4 Selection and installation of compatible appliances
- 9.5 Maintenance
- 10 Individual open-flued natural draught Types B11, B12, B13 appliances [Go to Page]
- 10.1 Design
- Figure 5 — Typical methods of using a flue liner in a masonry chimney installation serving a gas appliance, other than a back boiler
- Figure 6 — Installation of a gas fire and combined back boiler using a back boiler enclosure and prefabricated chimney: enclosure arrangement using a false chimney breast and closure panel
- Figure 7 — Installation of a gas fire and combined back boiler using a back boiler enclosure and prefabricated chimney: enclosure arrangement using a proprietary back boiler box
- Table 2 — Condensate-free lengths of individual open flue used with a gas fire
- Figure 8 — Maximum lengths for condensate-free chimneys for appliances other than gas fires
- Table 3 — Minimum void dimensions required below appliance connections
- Table 4 — Appliance/chimney combinations which require the chimney to be lined
- Figure 9 — Open-flued boiler connections to existing brick chimney
- 10.2 Installation
- 10.3 Commissioning of the chimney
- 10.4 Radon gas systems present
- 10.5 Maintenance
- 11 Individual open-flued fanned draught Types B14, B22, B23 appliances and fanned draught chimneys [Go to Page]
- 11.1 Design
- 11.2 Installation
- 11.3 Commissioning
- Table 5 — Minimum flow rates for fanned flues
- 11.4 Maintenance
- 12 Special categories of chimney [Go to Page]
- 12.1 Chimneys for Type C7 (“Vertex”) appliances
- 12.2 Other open-flued fanned draught chimneys
- 13 Maintenance/routine checks on the chimney/flue system [Go to Page]
- 13.1 General
- 13.2 Room-sealed fan-assisted positive pressure gas appliances
- 13.3 Balanced compartment
- 13.4 Individual open-flued natural draught Types B11, B12, B13, B14, B22, B23 appliances
- Annex A (informative) Classifications [Go to Page]
- Table A.1 — Classification of gas appliances used in the UK according to the method of evacuation of products of combustion (types)
- Table A.2 — Default values
- Annex B (informative) Calculation method for flue sizing [Go to Page]
- Table B.1 — Resistance factors for use in calculating equivalent heights (Use specific factors from flue or chimney manufacturer’s instructions where possible)
- Table B.2 — Inlet and outlet resistances
- Table B.3 — Minimum equivalent heights needed
- Figure B.1 — Worked example 1
- Figure B.2 — Worked example 2
- Annex C (normative) Chimney outlet positions [Go to Page]
- Figure C.1 — Open-flued, natural draught chimney outlet locations for pitched roofs
- Figure C.2 — Open-flued, natural draught chimney outlet locations adjacent to structures
- Figure C.3 — Open-flued or room-sealed, natural or fanned draught chimney outlet locations adjacent to openings into a building on pitched roofs
- Figure C.4 — Open-flued, natural draught chimney outlet locations on flat roofs
- Figure C.5 — Open-flued, natural draught chimney outlet
- Figure C.6 — Room-sealed configuration outlet location on pitched roofs
- Figure C.7 — Open-flued, fanned draught chimney and room-sealed configuration outlet locations adjacent to structures on pitched roofs
- Figure C.8 — Chimney outlet positions (see Table C.1 for key to open-flued chimney outlets and for room-sealed chimney configuration outlets)
- Table C.1 — Minimum dimensions of chimney outlet positions (refer to Figure C.8)
- Figure C.9 — Example of how a natural draught, room-sealed chimney configuration outlet position is measured
- Figure C.10 — Example of how a fanned draught room-sealed chimney configuration outlet and a fanned draught open-flued chimney outlet position is measured
- Figure C.11 — Proximity of flue duct outlet to a boundary
- Annex D (informative) Guidance checklist for positioning of chimney/flue terminations [Go to Page]
- Table D.1 — Guidance checklist
- Annex E (informative) Checking of case seals and the general integrity of room-sealed fan‑assisted positive pressure gas appliances [Go to Page]
- Figure E.1 — Checklist for checking case seals and the general integrity of room-sealed fan‑assisted positive pressure gas appliances
- Annex F (normative) Design criteria for terminals for shared system chimneys [Go to Page]
- Figure F.1 — Permitted recirculation of combustion products
- Annex G (informative) Guidance on the design and installation of flue block systems in the UK [Go to Page]
- Figure G.1 — Gas flue blocks
- Figure G.2 — Typical flue block systems (general arrangement)
- Figure G.3 — Bonded gas flue block system for timber frame construction
- Figure G.4 — Typical construction details for gas flue block systems in internal walls
- Figure G.5 — Typical construction details for gas flue block systems in external walls
- Bibliography [Go to Page]
