122
AIR DELIVERY (cont)
42S SERIES — UNIT SIZE 20 (SGM)
a42-4280
LEGEND
NOTE: The Mega Stack unit with an ECM can operate at any airflow and static pressure combination within the shaded area.
For high-static PSC and ECM fan performance data, refer to Carrier Electronic Selection Program.
ECM — Electronically Commutated Motor
ESP — External Static Pressure
PSC — Permanent Split Capacitor
SCFM — Square Cubic Feet Per Minute
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
600 800 1000 1200 1400 1600 1800 2000 2200 2400
ESP, in. wg
SCFM
Low
Medium
High
PSC Motor Fan Curve: 3 row 4 row 5 row ECM Operating Range:
Performance data (cont)
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