Ventilation Systems The purpose of the ventilation system is to maintain a standard of air quality in temperature and humidity for personnel habitation and for the removal of equipment-generated heat. Areas requiring critical temperature control are supported by heating and/or air conditioning essential to the equipments’ operation. Normal operations of the ventilation system are necessary to  the  removal  of  internally-generated  con- taminants, fumes, and humidity. Ventilation may be accomplished by either natural draft or by electrically driven blowers. Ventilation systems are designated as supply, exhaust, or recirculating systems. Individual ventilation systems between the main transverse bulkheads are large piping systems that can hinder watertight or fumetight integrity. This potential problem is overcome by ventilation closures installed in fire and flooding boundary bulkheads where penetrations are necessary. Ventilation systems are not installed in spaces that are entered infrequently. That minimizes the number of holes in bulkheads and decks and improves resistance to damage. Some examples are storerooms and voids. Wherever ventilation systems cross fire zone boundaries, fire dampers are installed at the bulkhead penetration. Portable  ventilation  systems  consisting  of electric driven (RED DEVIL) or air-turbine-driven blowers with attached flexible trunks are available for  emergency  application  when  the  installed ventilation  is  inoperable.  Portable  ventilation systems are a primary means of smoke and gas removal during post fire conditions. DAMAGE  CONTROL, FIRE-FIGHTING, EGRESS, AND CBR DEFENSE PROCEDURES During a crisis situation, such as battle damage or  shipboard  fires,  your  division’s  survival depends on its members’ knowledge and experience in damage control, fire-fighting, egress, and CBR defense procedures. DCPOs and duty DCPOs are responsible  for  ensuring  division  personnel understand these procedures. Damage Control The ship’s damage control organization is the means by which you can reach the damage control objectives. In fact, organization is the key to all successful damage control. The damage control organization establishes standard procedures for handling various types of damage. It also sets up training in those procedures so that every person will  know  immediately  what  to  do  in  each emergency situation. Both preventive and corrective actions are vital. The prevention of damage requires that all departments carry out the following actions: 1. 2. 3. Maintain the established material conditions of readiness Train all departmental personnel in all aspects of shipboard damage control Maintain the ship in the best condition possible to resist damage To achieve these goals, the ship’s damage control organization must be coordinated with other elements of the ship’s organization. There- fore,  each  department  must  assign  specific damage  control  duties  to  individuals  in  each division.  That  includes  the  designations  of  a divisional DCPO and duty DCPOs. The corrective aspect of damage control requires the damage control battle organization to promptly restore the offensive and defensive capabilities of the ship. The damage control organization consists of two elements: the damage control administrative organization  and  the  damage  control  battle organization. ADMINISTRATIVE  ORGANIZATION.  — The damage control administrative organization is part of the engineering department organiza- tion.  However,  each  department  has  major administrative  and  preventive  maintenance responsibilities, These responsibilities include the planned maintenance covering damage control equipment, systems, and fixtures within the departmental spaces. Each department head is to ensure the damage control planned maintenance system (PMS) assignments are completed and that discrepancies are documented and corrected. BATTLE ORGANIZATION. —The damage control  battle  organization  includes  damage control central (DCC), various repair parties, and battle dressing stations. The organization varies somewhat  from  one  ship  to  another.  The difference will depend upon the size, type, and 7-7