Diameters from 75 mm to 600 mm for use with solid fuel and oil burning appliances of output rating not exceeding 45 kW, for gas fired appliances, and for incinerators not exceeding 0.09 m3 capacity.
BS 835:1973 history
0000 BS 835:1973(2010)
1973BS 835:1973 Specification for asbestos-cement flue pipes and fittings, heavy quality