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Extract fan rate limits for gas appliances with open-flued combustion
2.17(a)NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
for a gas appliance – where a room contains an open-flued appliance, the room extract fan rate should not exceed 20 litres/second (72 m3/hour), and a spillage test as recommended in BS 5440: 1 should
gas-applianceopen-fluedventilationfire-safetyExtract fan rate limits for oil appliances with open-flued combustion
2.17(b)NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
for oil appliances – where a room contains an open-flued appliance the extract rate should be limited to 40 litres/second for an appliance with a pressure jet burner and 20 litres/second for an applia
oil-applianceopen-fluedventilationfire-safetyExtract fan installation for solid fuel appliances with open-flued combustion
2.17(c)NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
for a solid fuel appliance – a room extract fan should not be installed in the same room. If mechanical extraction is unavoidable then seek specialist advice from a mechanical/services engineer to ens
solid-fuel-applianceopen-fluedventilationfire-safetyPermanent vent openings in a solid floor for open-flued appliances
Diagram 2.3NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Diagram 2.3 Permanent vent openings in a solid floor airbrick, duct and grille should have an equivalent free area at least that recommended in Sections 3, 4 or 5 as relevant
open-fluedventilationdrainageConfiguration of natural draught flues serving open-flued appliances
2.40NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
A flue system should offer least resistance to the passage of the flue gas by minimising changes in direction or horizontal length. Where practicable the flue should be straight and vertical except fo
combustion-appliancesfluesopen-fluedLimits on flue bends and changes of direction
2.41NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
Provisions should be made to enable the flue to be swept and inspected. The number of changes of direction between the combustion appliance outlet and the flue outlet should be limited to not more tha
combustion-appliancesfluesopen-fluedmaintenanceOpenings in flues for inspection and cleaning
2.42NI-wide·Technical Booklet L Combustion Appliances and Fuel Storage Systems
A flue should not have an opening into more than one room or space except for the purposes of – (a) inspection or cleaning; or (b) fitting an explosion door, draught break, draught stabiliser or draug
combustion-appliancesfluesopen-flued