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N Furniture/ Equipment

N13 Sanitary appliances and fittings: 10, 11, 25, 30, 300, 302, 331, 335, 341, 346, 500
R Disposal systems

R10 Rainwater drainage systems: 241

R11 Above ground foul drainage systems: 21, 315, 345
S Piped supply systems

S90 Hot and cold water supply systems - domestic: 53, 540
T Mechanical heating, cooling and refrigeration

T90 Heating systems - domestic: 50, 410
Y General engineering services

Y10 Pipelines: 130