Section 19A(7) in The West Bengal Factories Rules, 1958
(7)In regions, where in summer (from 15th March to the 15th July) dry-bulb temperature of outside air in the workroom of a factory during most part of the day exceeds 35 degree centigrade and simultaneously wet-bulb temperature is 25 degree centigrade or below and, in the option of the Inspector, the manufacturing process carried on therein permits thermal environment with relative humidity of 50% or more, the Inspector may, subject to the control of the Chief Inspector. serve on the manager of the factory an order requiring him to have sufficient supply of outside air as needed for ventilation cooled by passing it through water spray either by means of unit type of evaporative aircooler (desert cooler) or, where supply of outside air is provided by mechanical means through ducts in a plenum system. by means of control air washing plants.
