When any flues or other apparatus are used in any such process or manufacture or labor referred to in section 292.310, and when such flues or other apparatus are being cleaned or emptied, the employer shall in every case provide and maintain a sufficient, adequate and efficient means or device, such as canvas bags or other approved device, or by dampening the dust, or some other efficient method for catching and collecting the dust and preventing it from unreasonably fouling or polluting the air in which the employees are obliged to work, and, wherever practicable, the dust occasioned in any process or manufacture referred to in section 292.310, and in any polishing or finishing therein, shall be dampened or wet down or covered, and every reasonable precaution shall be adopted by the employer to prevent the unnecessary creation or raising of dust, and all floors shall be washed or scrubbed at least once every working day; and such parts of the work or process as are especially dangerous to the employees, on account of poisonous fumes, dusts and gases, shall, where practicable, be carried on in separate rooms and under cover of some suitable and efficient device to remove the danger to the health of such employees as far as may be reasonably consistent with the manufacturing process, and the fixtures and tools employed in any such process or manufacture or labor, shall be thoroughly washed and cleaned at reasonable intervals.