3. Every room in any low throughout slaughterhouse or cutting premises in which any fresh meat is produced, worked on handled or stored shall have—
(a)floors and floor surfaces of impermeable, rot proof, non-slip and durable material, which shall be so constructed and kept in such good order, repair and condition as to enable them to be thoroughly cleaned and disinfected; (such floors shall be laid in such a way as to facilitate the drainage of water);
(b)interior wall surfaces faced with a smooth, durable, impermeable and washable material (which shall be of a light colour) to the following heights—
(i)in any of the rooms referred to in sub-paragraph 1(g) of Part I of this Schedule, and in sub-paragraphs 1(b),(e),(f),(g) and (i) of Part II of this Schedule, up to a height of not less than 3 metres or the full height of the room whichever is lower;
(ii)in rooms used for the cooling or storage of fresh meat, up to a height of not less than the usable storage height;
(iii)in any other room in which unpackaged fresh meat is handled, up to a height of not less than 2 metres;
save that in premises erected before 1st July 1991 such interior walls of rooms where only frozen fresh meat is stored may be made of wood;
(c)doors and door frames of a hard wearing, corrosion-resistant material or, if made of wood, with a smooth, impermeable covering on all surfaces;
(d)a ceiling, or where, there is no ceiling the interior surface of the roof, which is so constructed and finished so as to minimise condensation, mould development, flaking and the lodgement of dirt, and which shall be kept in such good order, repair and condition as to enable it to be thoroughly cleaned;
(e)insulation materials which are rot proof and odourless;
(f)suitable and sufficient means of ventilation to the external air (except in the case of a humidity-controlled or temperature controlled chamber) including, where necessary, adequate means of steam extraction (all ventilation systems to be kept at all times in good working order); and
(g)adequate artificial lighting throughout the slaughterhall and workrooms; which lighting shall not distort colours and shall be of an overall intensity of not less than 220 lux, save that at places where inspection of fresh meat is normally carried out the overall intensity shall be not less than 540 lux.