(Mar, 2012)
Compact CWE Series Installation, Operation & Maintenance Manual
ir Technology Systems, Inc.
2-4
2.5.2 Downfl ow Confi guration Air Patterns
In a downfl ow confi gured unit, the conditioned supply air discharges through the bottom of the unit into a raised
fl oor. There are two basic return air distribution methods: top free return and top ducted return. (See Figure 9).
The return air inlet is provided with a turned in fl ange on top of the unit for connection of ductwork (refer to the
installation drawing provided with the unit). The connection of ductwork to the unit may be made with either pop
rivets or self-tapping screws.
If ductwork is to be installed, always consult your state and local codes when determining ducting requirements.
The duct system should be designed to allow the air to move with as little resistance as possible.
Figure 9- Downfl ow Confi guration Air Patterns
RETURN
AIR INLET
SUPPLY
AIR OUTLET
TOP DUCTED RETURN
TOP FREE RETURN
RETURN
AIR INLET
SUPPLY
AIR OUTLET
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