|   | 
      
        
          | a | 
          ZULUFT. . .  zB TURM  | 
         
        
          |   | 
          Supply air. . . for example, to conning tower  | 
         
        
          |   | 
            | 
         
        
          | a1 | 
          WARMZULUFT SEHROHR  | 
         
        
          |   | 
          Warm supply air to periscope  | 
         
        
          |   | 
            | 
         
        
          | a2 | 
          NOTZULUFT TURM  | 
         
        
          |   | 
          Emergency supply air to conning tower  | 
         
        
          |   | 
            | 
         
        
          | a3 | 
          BORDVENTIL NOTZULUFT ZENTRALE und TRUM  | 
         
        
          |   | 
          Hull valve, emergency supply air  to control room and conning tower  | 
         
        
          |   | 
            | 
         
        
          | a4 | 
          BORDABSPERRUNG NOTZULUFTHAHN | 
         
        
          |   | 
          Hull valve, emergency supply air | 
         
        
          |   | 
            | 
         
        
          | b | 
          ABLUFT. . .  zB HORCHRAUM  | 
         
        
          |   | 
          Exhaust air valve. . .  for example, listening room  | 
         
        
          |   | 
            | 
         
        
          | b1 | 
          NATÜRLICHE ABLUFT. . .  zB BATTERIE 1  | 
         
        
          |   | 
          Natural exhaust air . . for example, battery compartment 1  | 
         
        
          |   | 
            | 
         
        
          | b2 | 
          NOTABLUFT TRUM  | 
         
        
          |   | 
          Emergency exhaust air. . .  for example, conning tower | 
         
        
          |   | 
            | 
         
        
          | b3 | 
          BORDVENTIL NOTABLUFT ZENTRALE und TURM  | 
         
        
          |   | 
          Hull valve, emergency exhaust air, control room and conning tower  | 
         
        
          |   | 
            | 
         
        
          | b4 | 
          BORDABSPERRUNG NOTLUFTHAHN. . .  zB HECKTORPEDO und ELEK. MASCH. RAUM  | 
         
        
          |   | 
          Hull valve emergency exhaust air. . .  for example stern torpedo and electric motor room | 
         
        
          |   | 
            | 
         
        
          | b5 | 
          BORDABSPERRUNG NOTLUFTHAHN. . .  zB TRUM  | 
         
        
          |   | 
          Hull valve emergency air. . .  for example, conning tower | 
         
        
            | 
            | 
         
        | 
        | 
      
        
          | c | 
          ZULUFTFUẞVENTIL | 
         
        
          |   | 
          Supply air foot valve | 
         
        
          |   | 
            | 
         
        
          | c1 | 
          ABLUFTFUẞZVENTIL | 
         
        
          |   | 
          Exhaust air foot valve | 
         
        
          |   | 
            | 
         
        
          | d | 
          ZULUFTKOPFVENTIL | 
         
        
          |   | 
          Supply air head valve | 
         
        
          |   | 
            | 
         
        
          | d1 | 
          ABLUFTKOPFVENTIL | 
         
        
          |   | 
          Exhaust air head valve | 
         
        
          |   | 
            | 
         
        
          | d2 | 
          TURMLUFTKOPFVENTIL | 
         
        
          |   | 
          Conning tower air  head valve | 
         
        
          |   | 
            | 
         
        
          | e | 
          REGELVENTIL LUFTERNEUERUNSGERÄT  | 
         
        
          |   | 
          Regulating valve, air conditioners  | 
         
        
          |   | 
            | 
         
        
          | f | 
          ANSCHLUẞ ABSAUGEN ETO  | 
         
        
          |   | 
          Suction connection gor Eto (for ventilation of torpedo batteries) | 
         
        
          |   | 
            | 
         
        
          | f1 | 
          ZULUFTANSCHLUẞ TURM | 
         
        
          |   | 
          Supply air connection for conning tower  | 
         
        
          |   | 
            | 
         
        
          | f2 | 
          ABLUFTANSCHLUẞ. . .  zB HORCHRAUM  | 
         
        
          |   | 
          Exhaust air connection. . .  for example, listening room [typo f2 is  in the exhaust air duct from the provisions room] | 
         
        
          |   | 
            | 
         
        
          | f3 | 
          NOTZULUFTANSCHLUẞ ZENTRALE und TURM  | 
         
        
          |   | 
          Emergency supply air connection to control room and conning tower  | 
         
        
          |   | 
            | 
         
        
          | f4 | 
          NOTABLUFTANSCHLUẞ ZENTRALE und TURM  | 
         
        
          |   | 
          Emergency exhaust air connection to control room and conning tower  | 
         
        
            | 
            | 
         
        | 
        | 
      
        
          
            | g | 
            ZULUFTSTRANG. . .  zB BUGTORPEDORAUM  | 
           
          
            |   | 
            Bulkhead stop valves, supply air line. . .  for example, to forward torpedo room  | 
           
          
            |   | 
              | 
           
          
            | g1 | 
            ABLUFTSTRANG. . .  zB HINTEN DISELMOTORENRAUM  | 
           
          
            |   | 
            Bulkhead stop valves,  exhaust air line. . .  for example to after end of the Diesel engine room  | 
           
          
            |   | 
              | 
           
          
            | h | 
            VERBINDUNG RAUMLÜFTER  | 
           
          
            |   | 
            Cross-connection valve, compartment ventilation systems; i.e., connects port and starboard systems | 
           
          
            |   | 
              | 
           
          
            | i | 
            RAUMZULUFTWÄHLER | 
           
          
            |   | 
            Compartment supply air selector | 
           
          
            |   | 
              | 
           
          
            | k | 
            RAUMABLUFTSCHALTER | 
           
          
            |   | 
            Compartment exhaust air selector | 
           
          
            |   | 
              | 
           
          
            | k1 | 
            NOTZULUFTSCHALTER | 
           
          
            |   | 
            Emergency  supply air control | 
           
          
            |   | 
              | 
           
          
            | k2 | 
            NOTABLUFTSCHALTER | 
           
          
            |   | 
            Emergency exhaust air control | 
           
          
            |   | 
              | 
           
          
            | k3 | 
            SAUERSTOFFSCHALTER. . .  zB DISELMOTORAUM | 
           
          
            |   | 
            Oxygen supply control. . .  for example, Diesel engine room | 
           
          
            |   | 
              | 
           
          
            | l | 
            ABSAUGEN. . .  zB KÜCHE  | 
           
          
            |   | 
            Suction connection. . .  for example, galley | 
           
          
            |   | 
              | 
           
          
            | m | 
            ENTWÄSSERN. . .  zB ZULUFTFUẞVENTIL  | 
           
          
            |   | 
            Drain. . .  for example, supply air foot valve  | 
           
          
              | 
              | 
           
         
        | 
        |