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Filling spaces between chimney liner and masonry
2.22NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Spaces between the lining and the surrounding masonry should not be filled with ordinary mortar. In the absence of the liner manufacturer's instructions, the space should be filled with one of the fol
combustion-appliancesflue-systemschimneyConstruction of flue block chimneys
2.23NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
A flue block chimney should be constructed of factory-made components suitable for the intended application and installed in accordance with the manufacturer's instructions. The flue blocks should hav
combustion-appliancesflue-systemschimneySealing joints and forming bends in flue block chimneys
2.24NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Joints should be sealed in accordance with the flue block manufacturer's instructions. Bends and offsets should only be formed with matching factory-made components.
combustion-appliancesflue-systemschimneyWall thickness for masonry and flue block chimneys
2.25NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
The thickness of the walls for a masonry chimney around the flue, excluding the thickness of any flue liner, should be in accordance with Diagram 2.4.
combustion-appliancesflue-systemschimneystructuralSeparation of Combustible Material from Factory-Made Metal Chimney
Diagram 2.5NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
No combustible material in shaded zone. Width of shaded zone at least equal to manufacturer's declared minimum distance (XX mm) as defined by testing to BS EN 1443: 2003 or 25 mm, whichever is the gre
fire-safetycombustion-applianceschimneyFactory-made metal chimneys
3.19NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Guidance on factory-made metal chimneys is given in paragraphs 2.34(a) and 2.35 to 2.38. Table 3.4 gives minimum performance designations for chimney and flue pipe components for use with new solid fu
non-domesticdwellingcombustionchimneyLining or relining flues in chimneys
3.20NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
The lining of a flue should correspond to the designation T400 N2 D3 G, as described in BS EN 1443.
non-domesticdwellingchimneycombustionMinimum performance designations for chimney and flue pipe components for solid fuel fired appliances
Table 3.4NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Table 3.4 Minimum performance designations for chimney and flue pipe components for use with new solid fuel fired appliances Appliance type | Minimum designation | Fuel type All solid fuel appliance
dwellingnon-domesticcombustionchimneysolid-fuelDebris collection space for chimneys
4.32NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
A debris collection space should be provided at the base of a chimney unless it is lined, constructed of flue blocks, or is a factory-made metal chimney with a flue box. The space should have a volume
combustion-appliancechimneyfluePressure classes
B.8NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Pressure classes are set out in Table B2 and expressed as either 'N', 'P' or 'H' followed by either '1' or '2'. N relates in general to natural draught chimneys i.e. operating under negative pressure
combustion-applianceschimneyflue-systemsCondensate resistance classes
B.9NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Condensate resistance class – expressed as either 'W' for wet or 'D' for dry operations. A product designated 'W', able to contain condensates within the flue, is aimed at condensing appliances. A pro
combustion-applianceschimneyflue-systemsSootfire resistance classes
B.10NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Sootfire resistance class – expressed as either 'G' with sootfire resistance, or 'O' without. A product assigned the designation 'G' has been tested at 1000ºC for 30 minutes.
combustion-applianceschimneyflue-systemsfire-safetyDistance to combustible material
B.11NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
The designation of the minimum distance from the outer surface of the chimney to combustible material is given as xx expressed in millimetres (e.g. the distance 'XX' identified in paragraph 2.37 and D
combustion-applianceschimneyflue-systemsfire-safetyprotection-from-fallingPressure classes table
Table B2NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Table B2 Pressure classes Pressure class | Test pressure Pa | Gas tightness Maximum leakage rate L/s/m2 N1 | 40 | 2.0 N2 | 20 | 3.0 P1 | 200 | 0.006 P2 | 200 | 0.120 H1 | 5000 | 0.006 H2 | 5000 | 0.1
combustion-applianceschimneyflue-systems