Section 299. Ventilation, heating and humidity

1. Every work room in a
  factory  shall  be  provided  with  proper  and  sufficient   means   of
  ventilation,  natural  or  mechanical  or both, as may be necessary, and
  there shall be maintained therein proper and sufficient ventilation  and
  proper  degrees  of  temperature  and  humidity  at all times during the
  working hours. If owing to  the  nature  of  the  manufacturing  process
  carried  on  in the factory work room excessive heat be created therein,
  there shall be provided, maintained and operated such special  means  or
  appliances as may be required to reduce such excessive heat.
    2.  All machinery creating dust or impurities in quantities tending to
  injure the health of employees shall be equipped with proper  hoods  and
  pipes  connected  to  an exhaust fan of sufficient capacity and power to
  remove such  dusts  or  impurities;  such  fan  shall  be  kept  running
  constantly  while  such  machinery  is in use. If the board decides that
  such apparatus  is  unnecessary  for  the  health  and  welfare  of  the
  employees,  or  that  other  means  of  protection  may  be  provided to
  safeguard the health and welfare of the employees against such injurious
  dusts or impurities, it may adopt rules excepting  such  machinery  from
  the  operation  of this subdivision, or prescribing such requirements as
  will effectuate the intent of this subdivision.
    3. If dust, gases, fumes,  vapors,  fibers  or  other  impurities  are
  generated  or  released  in the course of the business carried on in any
  workroom of a factory, in quantities tending to injure the health of the
  employees, suction devices shall be provided  which  shall  remove  such
  impurities   from   the   workroom,  at  their  point  of  origin  where
  practicable, by means of proper hoods connected to conduits and  exhaust
  fans.  Such  fans  shall be kept running constantly while the impurities
  are being generated or released.
    4. The board shall make rules for and fix  standards  of  ventilation,
  temperature  and  humidity  in factories and shall prescribe the special
  means,  if  any,  required  for  removing  impurities  or  for  reducing
  excessive  heat,  and  the machinery, apparatus or appliances to be used
  for any of said purposes, and the construction,  equipment,  maintenance
  and operation thereof.
    5.  If  any requirement of this section or any rule adopted thereunder
  be not complied with, the commissioner shall issue  an  order  directing
  compliance  therewith  within thirty days after the service thereof.  He
  may in such order require plans and specifications to be filed. In  such
  case,  before  providing  or  making  any  change  or  alteration in any
  machinery or apparatus  for  any  of  the  purposes  specified  in  this
  section,  the  person upon whom such order is served shall file with the
  commissioner plans and specifications  therefor  and  shall  obtain  his
  approval of the same.