Carrier 40QSM009DS Service Manual page 19

2.3.4 A6 Duct Units
Higher Static Pressure
2.3.4.1.

As a ducted air conditioner with medium static pressure, it has the widest static pressure range.

The maximum static pressure reaches 160Pa
Slim Design
2.3.4.2.

The industry Lowest height is designed to be fitted into tight roof spaces.
*18K unit - 210mm,24K/36K unit - 249mm,48K unit -300mm
2.3.4.3. Constant air volume control

For ordinary duct, when the static pressure exceeds the expected range, it is fairly difficult even for
an experienced installer to calculate and adjust the air volume precisely.

With constant air volume control technology, the duct will automatically adjusts to perfect static
pressure and keep constant air volume.
Flexible Air Intake Way (Bottom side or Rear side)
2.3.4.4.
 The frame size of air inlet in rear and bottom is the same. It's very easy to switch to match different
application.
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