Wherever conditions of high temperature may be created, or where steam, gases, vapor, dust or other impurities in the air may be produced, which may be injurious to health, all rooms or local areas within rooms affected by these conditions shall be provided with ventilation additional to that required by sections 2 and 6 to the satisfaction of the local authority in such a manner as to prevent harm to any person whether within or without such rooms:

Provided that, where noxious gases, vapors or dust are produced, provision shall be made to extract them from the rooms or areas concerned.