Part A(1)
(a)Manufacturing ceramic products (including roofing tiles, bricks, refractory bricks, tiles, stoneware or porcelain) by firing in kilns, where—
(i)the kiln production capacity is more than 75 tonnes per day; or
(ii)the kiln capacity is more than 4m3 and the setting density is more than 300 kg/m3,
and a reducing atmosphere is used other than for the purposes of colouration.