law: Factories Act, 1948 
  13. Ventilation and temperature 
  (1) Effective and suitable provision shall be made in every
  
  factory for securing and maintaining in every workroom
  (a) adequate ventilation by the circulation of
  
  fresh air, and
  (b) such a temperature as will secure to
  
  workers therein reasonable conditions of comfort and prevent injury to health;
  and in particular,- 
  ( i ) walls and roofs shall be of such
  
  material and so designed that such temperature shall not be exceeded but kept
  
  as low as practicable;
  (ii) where the nature of the work carried on in the factory
  
  involves, or is likely to involve, the production of excessively high
  
  temperatures, such adequate measures as are practicable shall be taken to
  
  protect the workers there from, by separating the process which produces such
  
  temperatures from the workroom, by insulating the hot parts or by other
  
  effective means.
  (2) The State Government may prescribe a standard of adequate
  
  ventilation and reasonable temperature for any factory or class or description
  
  of factories or parts thereof and direct that 18[proper measuring
  
  instruments, at such places and in such position as may be specified, shall be
  
  provided and such records, as may be prescribed, shall be maintained.]
   34  [(3) If it appears to the Chief Inspector that excessively
  
  high temperatures in any factory can be reduced by the adoption of suitable
  
  measures, he may, without prejudice to the rules made under sub-section (2),
  
  serve on the occupier, an order in writing specifying the measures which, in
  
  his opinion, should be adopted, and requiring them to be carried out before a
  
  specified date.]