*
Muffler (2)

*
P5 air outlet (2)

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P11 air outlet

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Windows 2 and 3 air outlet (4)

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Sidewall air outlet (3)

*
Adjustable air outlet (6).

Location
Components are in these areas:
*
Mix bay

*
Forward cargo compartment, left sidewall area

*
Left side of the main equipment center

*
Forward equipment center

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Flight deck.

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AIR CONDITIONING -PASSENGER CABIN CONDITIONED AIR DISTRIBUTION -LOWER LOBE AREA

General
The passenger cabin air distribution system moves air from the mix manifold to the passenger cabin area.
In the lower lobe area, conditioned air moves from the mix manifold through eight ducts that connect to risers. Six of the ducts are outboard of the forward cargo compartment, three on each side. Two of the ducts are above the center wing box area.
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AIR CONDITIONING -PASSENGER CABIN CONDITIONED AIR DISTRIBUTION -PASSENGER CABIN AREA

General
In the cabin area, the system moves conditioned air to the passenger cabin from the ducts in the lower lobe area (not shown).
The system has these components in the cabin area:
*
Risers

*
Overhead distribution ducts

*
Air outlets.

Riser
There are eight risers, four on each side of the cabin. The risers connect the conditioned air ducts (not shown) in the lower lobe area to conditioned air ducts above the passenger cabin ceiling. To decrease noise, each riser has four round ducts that have insulation over them. The insulation also decreases the collection of water on the outside of the ducts. The risers are identified by the zone that they give air to. These are the risers:
*
Zone A, first riser on the left

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Zone B, first riser on the right

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Zone C, second riser on the left

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Zone D, second riser on the right

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Zone E, third set of risers

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Zone F, fourth set of risers.

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Overhead Distribution Ducts
The overhead distribution ducts connect the risers to the conditioned air outlet ducts. The ducts have different sizes and shapes. Insulation on the ducts decrease noise and the collection of water on the outside of the ducts. The ducts have connections for the upper recirculation system (not shown) and the door area heating system (not shown). See the recirculation section for more information about the upper recirculation system (SECTION 21-25). See the supplemental heating section for more information about the door heating system (SECTION 21-45).
*
Upper recirculation system (not shown)

*
Gasper air system (not shown)

*
Door area heating system (not shown).

Air Outlet Ducts
There are two air outlet ducts for each passenger cabin temperature control zone. Each zone has a duct above the left and right passenger aisles. The air outlet ducts control the flow of conditioned air into the passenger cabin zones. The air outlets ducts collect water that can be in the air from the recirculation system. Insulation on the ducts decrease noise and the collection of water on the outside of the ducts. Each duct has these parts:
*
Flow straightener

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Baffle tube

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Antifungal felt

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AIR CONDITIONING -PASSENGER CABIN CONDITIONED AIR DISTRIBUTION -PASSENGER CABIN AREA

*
Plenum sidewall

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Plenum duct.

Ceiling panels and the air outlet grill attach to the lower part of the air outlet duct. See the passenger compartment section for more information about the ceiling panels and the air outlet grill (SECTION 21-20).
Return Air Grills
Return air grills (not shown) below the sidewall panels in the passenger cabin let air move from the passenger cabin area to the lower lobe area. Cabin air in the lower lobe can flow out of the airplane through the outflow valves or into these systems:
　
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