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Measurement of flue height for open fires and closed appliances
3.10NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
The height of a flue serving an open fire is measured vertically from the highest point at which air can enter the fireplace to the level at which the flue discharges into the outside air. The highest
non-domesticdwellingcombustionflueFactory-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-domesticdwellingchimneycombustionFormation of gathers
3.21NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
To minimise resistance to the proper working of a flue, a tapered gather should be provided in the fireplace for an open fire. This should be formed by – (a) using prefabricated gather components buil
dwellingnon-domesticcombustionfireplaceMinimum 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-fuel