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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-domesticdwellingcombustionflueGeneral requirement for flue outlets
3.11NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
The outlet from a flue should be above the roof of the building in a position where the products of combustion can discharge freely and will not present a fire hazard, whatever the wind conditions.
non-domesticdwellingfire-safetyflueFlue outlet position in common circumstances
3.12NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
The flue outlet position, in common circumstances, should be in accordance with Table 3.3. However, the flue outlet position and/or separations shown in Table 3.3 may have to be increased, in particul
non-domesticdwellingfire-safetyflueFlue outlet positions for solid fuel appliances
Table 3.3NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Table 3.3 Flue outlet positions for solid fuel appliances Item 1 - At or within 600 mm of the ridge: Not less than 600 mm above the ridge. Item 2 - Elsewhere on a roof, whether pitched or flat: Not
non-domesticdwellingfire-safetyflueTreatment of vertical flues on outside walls
Table 3.3, Note 4NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
A vertical flue fixed to an outside wall should be treated as equivalent to an inside flue emerging at the nearest edge of the roof.
non-domesticdwellingfire-safetyflueDebris 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-appliancechimneyflue