10.2.5.3. The mechanical ventilation system in the rooms prescribed in subparagraphs 1 to 3, 5 and 16 of the first paragraph of section 10.2.2.1, in subparagraphs 1 and 5 of the first paragraph of section 10.2.3.1 and in subparagraphs 1 to 3 and 10 of the first paragraph of section 10.2.4.1 must have air vents with filters so as to prevent the entry of insects or dust contaminated air.