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 B.  Air from the control cabin is exhausted through miscellaneous openings and grilles in the floor, and is drawn into the electronic equipment compartment to provide electrical/electronic equipment cooling (AMM 21-58-03/001) and forward cargo compartment heating (AMM 21-43-00/001).
 2.  Control Cabin Conditioned Air Outlets_____________________________________
 A.  The control cabin conditioned air distribution duct branches into several risers which feed outlets in the control cabin. The outlets are located to provide optimum flow patterns in the cabin (Fig. 1).
 B.  The control cabin outlets consist of overhead diffusers, underseat diffusers, foot air outlets, windshield outlets and an individual (gasper) air outlet for each pilot. On some 737-300s, two small mufflers are located upstream of the pilots gasper outlets. A small muffler is also located between the under seat outlets to reduce air noise.
 C.  The overhead diffusers are located on the cabin ceiling, just above and aft of window No. 3. Each of these outlets can be opened or closed to any desired extent by turning a slotted adjusting screw. Directional control of airflow is provided by a movable external baffle. An individual (gasper) air outlet is located by the left overhead diffuser.
 D.  The captain's and first officer's diffusers are on the floor, directly under each seat. These outlets cannot be manually controlled and air flows continuously as long as the distribution system is pressurized.
 E.  There is a dual purpose valve at the end of the distribution duct behind the rudder pedals for the captain and one for the first officer. Two cable controlled knobs marked FOOT AIR and WINDSHIELD AIR are fastened on a bracket below the captain's and first officer's instrument panel. Pulling either knob moves a baffle plate attached to a lever allowing a choice between no conditioned air and full capacity conditioned air to either the foot outlets, the windshield duct, or both (Fig. 2).
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 21-22-00
 ALL  ú ú 01 Page 1 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FOOT WARMERS
MUFFLER
OUTLET (EXAMPLE)

1NOT INSTALLED ON ALL

A
737-300 AIRPLANES

Control Cabin Air Distribution Component Location
Figure 1

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 ALL  ú ú 02 Page 2 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B02357
A

737-300/400/500
MAINTENANCE MANUAL

CAPTAIN'S INSTRUMENT PANEL, P1  FIRST OFFICER'S INSTRUMENT PANEL, P3

WINDSHIELD 
AIR 
LOWER 
INSTRUMENT  FOOT 
PANEL  AIR 

SEE A
OPEN POSITION
CLOSED POSITION
WINDSHIELD TAB
CONTROL AIR OUTLET
CABLES
VALVE POSITION TAB (WINDSHIELD OUTLETSEE B IN CLOSED POSITION)
FOOT WARMER OUTLET
CABLE
WINDSHIELD AIR AND FOOT OUTLET CONTROL CABLE
CABLE
A SEAM TAB (FOOT OUTLET IN CLOSED POSITION)
VALVE POSITION
B
Windshield Air and Foot Outlet Valve Control Figure 2 (Sheet 1)
E78596
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 21-22-00
 MOLDED WINDSHIELD AIR  ú
 AND FOOT WARMER OUTLETS  ú 02 Page 3 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

CAPTAIN'S INSTRUMENT PANEL, P1  FIRST OFFICER'S INSTRUMENT PANEL, P3

WINDSHIELD AIR  FOOT AIR 
SEE  C 
FOOT OUTLET OPEN  CONTROL CABLES  OPEN POSITION 
CLOSED 
POSITION 
(TYPICAL) 
WINDSHIELD AIR 
VALVE OPEN 
C 
WINDSHIELD AIR 
VALVE CLOSED 
TO WINDSHIELD 
WINDSHIELD AIR AND 
FOOT OUTLET VALVE 
　
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