16. Every factory and the equipment used therein shall be kept in a clean state, and free from effluvia arising from any drain, sanitary convenience or nuisance, and, without prejudice to the generality of the foregoing provision-
(a) accumulations of dirt and refuse shall be removed daily by a suitable method from the floors and benches of workrooms, and from the staircases and passages;
(b) the floor of every workroom shall be cleaned at least once in every week by washing or, if it is effective and suitable, by sweeping or other method;
(c) all waste water shall be conducted into a covered pit through pipes or underground drains;
(d) all inside walls and partitions, and all ceilings or tops of rooms, and all walls, sides and tops of passages and staircases, shall-
(i) where they have a smooth impervious surface, at least once in every period of fourteen months, be washed with hot water and soap or other suitable detergent or cleaned by such other method as may be approved by an Inspector;
(ii) where they are kept painted with oil paint or varnished, be repainted or revarnished at least once in every period of five years, and at least once in every period of fourteen months be washed with hot water and soap or other suitable detergent or cleaned by such other method as may be approved by an Inspector;
(iii) in other cases be kept limewashed, and the limewashing shall be repeated at least once in every period of fourteen months;
(e) all woodwork shall be painted by such methods as may be approved by the Inspector:
Provided that-
(i) except where an Inspector in any case otherwise requires, the provisions of paragraph (d) of this section shall not apply to any factory where mechanical power is not used and less than ten persons are employed; and
(ii) where it appears to the Chief Inspector that in any factory or parts thereof any of the foregoing provisions of this section are not required for the purpose of keeping the factory in a clean state, or are by reason of special circumstances inappropriate or inadequate for such purpose, he may, if he thinks fit, by order in writing, direct that those provisions shall not apply to such factory or parts thereof, or shall apply as varied by the order.