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 (a)  Carefully install the blue side of the media on the upstream side of the prefilter frame.
 NOTE: The upstream side can be identified by the airflow
____ arrow on the side of the media.
 S 424-051
 (2)  Install the prefilter on the top of the HEPA filter in the filter support.
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 S 414-052
 (3)  Install the access door:
 (a)  Use the fasteners to attach the access door to the filter support (14 Locations).
 S 414-017
 (4)  Install this access panel:
 (a)  Access Panel, Right - Forward Cargo Compartment Aft Bulkhead
 S 864-023
 (5) Remove the DO-NOT-OPERATE identifiers if no longer necessary.
 TASK 21-21-23-004-055
 6.  AIRPLANES WITH A TWO PIECE FILTER INSTALLATION; Recirculation Fan HEPA Filter Removal (Fig. 401)_____________________________________
 A.  General
 (1)  One recirculation fan filter installation is installed in the air-conditioning distribution bay.
 B.  References
 (1)  AMM 12-31-01/201, Zone Diagrams
 C.  Access
 (1)  Location Zone (AMM 12-31-01/201)
 210 Air Conditioning Distribution Bay

 D.  Procedure
 S 864-056
 (1)  Set these switches to the OFF position and attach DO-NOT-OPERATE identifiers:
 (a)  P5-10 Air Conditioning Module
 1) R PACK
 2) L PACK
 3) RECIRC FAN

 S 014-057
 (2)  Remove this access panel:
 (a)  Access Panel, Right - Forward Cargo Compartment Aft Bulkhead
 S 024-058
 (3)  Remove the recirculation fan HEPA filter:
 (a)  
Remove the fasteners (fourteen locations) which hold the access door to the filter support.

 (b)  
Remove the access door.

 (c)  
Remove the prefilter.

 (d)  
Remove the HEPA filter.

 TASK 21-21-23-404-059
 7.  AIRPLANES WITH A TWO PIECE FILTER INSTALLATION; Recirculation Fan HEPA Filter Installation (Fig. 401)__________________________________________
 A.  References
 (1)  AMM 12-31-01/201, Zone Diagrams
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737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone (AMM 12-31-01/201)
 210 Air Conditioning Distribution Bay

 C. Procedure
 S 424-060
 (1)  Install the recirculation fan HEPA filter:
 (a)  
Install the HEPA filter.

 (b)  
Install the prefilter on top of the HEPA filter.

 NOTE: Make sure the flow arrow on the side of the
____ prefilter media is correctly positioned.
 (c)  
Put the access door in position.

 (d)  
Install the fasteners (14 locations) to attach the access door to the filter frame.

 S 414-061
 (2)  
Install this access panel:

 (a)  Access Panel, Right - Forward Cargo Compartment Aft Bulkhead

 (3)  
Remove the DO-NOT-OPERATE tags if no longer necessary.

 S 864-043
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737-300/400/500MAINTENANCE MANUAL
 RECIRCULATION FAN CHECK VALVE - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
　
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