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  • Ventilation
    Such exhaust may be of the natural variety previously described or may be mechanical by means of roof or wall exhaust fans or mechanical exhaust systems.
    The shutoff dampers are interlocked with the associated roof or wall exhaust fans and the space thermostats control the operation of the shutoff dampers and exhaust fans.
  • Welding - Ventilation : OSH Answers : Printer-friendly
    Dilution ventilation adds new fresh air to an area and can be accomplished by non-mechanical means such as opening windows and doors, or mechanical means such as wall and roof exhaust fans .