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 1.  General (Fig. 1)_______
 A.  The gasper air system provides conditioned air to a gasper outlet at each passenger and attendant's seat. The gasper ducting connects to the passenger and flight compartment conditioned air supply.
 B.  Gasper air is fed from the sidewall distribution air ducts to individually controlled gasper air outlet valves mounted in all passenger, attendant, and lavatory service units. Branch fittings direct a portion of the sidewall distribution air through flexible hose to an air manifold mounted above the service unit. Gasper air outlets control the flow and direction of air.
 2.  Component Details_________________
 A.  Gasper Air Outlet Valve
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 (1)  The gasper air outlet valves mount in each PSU. The outlet valves may be adjusted manually to provide proper volume and airflow direction. Each outlet valve consists of a drilled ball within a socket and an adjustable valve to control airflow volume.
GASPER AIR OUTLET
Individual (Gasper) Air Distribution System
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 RECIRCULATION SYSTEM - DESCRIPTION AND OPERATION
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 1.  General (Fig. 1)
 A.  The recirculation system consists of two separate systems. The left recirculation system provides draw-thru cooling for the forward exhaust Electrical/Electronic (E/E) equipment (Ref 21-58-00) cooling system. The right recirculation system provides recirculation of conditioned air for the passenger cabin.
 B.  Recirculated air from both systems mixes with conditioned air from the cooling packs (AMM 21-51-00/001) in the mix manifold (AMM 21-21-00/001). The 50/50 mixture of fresh conditioned air and recirculated air is distributed through the passenger cabin. The use of recirculated air improves airflow without placing an undue load on the air supply source (AMM 36-10-00/001) or the cooling packs.
 C.  Both recirculation systems contain a filter assembly, a recirculation check valve, a recirculation fan, and ducting.
 D.  The right recirculation system draws air from the passenger cabin through the return air grilles, into the forward cargo compartment sidewalls. From there it is drawn into the filters and fan, to be blown through the check valves into the mix manifold.
 E.  The left recirculation system provides draw-thru cooling of the main panels, overhead panels, weather radar, and the forward equipment. Air is drawn through the components and fan, to be blown through the check valve and filter, into the mix manifold.
 2.  Component Details_________________
 A.  Recirculation Air Fan
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 (1)  
Physical Description

 (a)  
The right recirculation fan is a 14 pound, single stage vane-axial fan. It is located on the right side of the aft bulkhead in the forward cargo compartment. A twelve-bladed impeller is integrated into the motor by a common shaft. De-swirl vanes are attached to the fan case downstream of the impeller, and help cool the motor. The vanes channel the airflow into the ducting leading to the mix manifold.

 (b)  
The left recirculation fan is a 20 pound, single stage, mixed-flow fan, located in the left forward sidewall of the forward cargo compartment.

 (c)  
The left fan contains a de-swirl outlet assembly, an inlet assembly, a motor assembly, an end bell assembly, and an impeller. The twelve bladed impeller shares a common shaft with the motor. Airflow from the impeller cools the fan motor.

 (d)  
Both fans contain a thermal switch in the winding of each phase of the fan motors. The thermal switches provide overheat protection for the motors. Damage caused by foreign objects, reduced airflow, two-phasing, improper voltage, or bearing overheat causes the thermal switches to open when the fan reaches 350°F (177°C).

 (e)  
The recirculation fans both require 115v ac, 3 phase power, and are designed for continuous high speed operation.

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