# The Smoke Control Areas (Authorised Fuels) Regulations 1991, Paragraph 4

Extent: E+W+S
Status: prospective

Antrex briquettes, manufactured by Agglonord, Agglomérationdu Nord, at Oignies, France, which—
(a) comprise anthracite;
(b) were manufactured from the anthracite by a process involvingroll-pressing and heat treatment at about 180°C;
(c) are pillow-shaped ovoids with three small grooves on one side andhave an average weight of 40 grammes; and
(d) have a sulphur content not exceeding 1 per cent of the total weight.

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Source: https://www.legislation.gov.uk/uksi/1991/1282/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-regulations-1991/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.