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PERFORMANCE DATA (cont)
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
LEGEND
*Motor drive ranges:
Low Range: 805-1007
High Range: 941-1176
All other rpms require field-supplied drive.
Refer to page 261 for general Fan Performance Data notes.
NOTE: Maximum continuous bhp is:
Low Range: 5.75
High Range: 8.63
581A300 (25 TONS) (Low Heat Units)*
Airflow
(Cfm)
External Static Pressure (in. wg)
0.2 0.4 0.6 0.8 1.0
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
6,500 786 2,658 3.06 819 2,835 3.26 857 3,052 3.51 899 3,304 3.80 943 3,586 4.12
7,000 842 3,208 3.69 871 3,386 3.89 905 3,599 4.14 943 3,847 4.42 983 4,123 4.74
7,500 898 3,827 4.40 925 4,006 4.61 955 4,217 4.85 989 4,460 5.13 1026 4,733 5.44
8,000 955 4,518 5.20 979 4,699 5.40 1007 4,908 5.65 1037 5,148 5.92 1070 5,416 6.23
8,500 1012 5,284 6.08 1034 5,466 6.29 1059 5,675 6.53 1087 5,912 6.80 1117 6,176 7.10
9,000 1069 6,127 7.05 1090 6,312 7.26 1113 6,521 7.50 1138 6,757 7.77 1165 7,017 8.07
9,500 1127 7,050 8.11 1146 7,238 8.32 1167 7,448 8.57 1190 7,682 8.84 1215 7,940 9.13
10,000 1184 8,057 9.27 1202 8,247 9.49 1221 8,460 9.73 1243 8,693 10.00 1266 8,948 10.29
10,500 1242 9,149 10.52 1258 9,344 10.75 1276 9,557 10.99 1296 9,791 11.26 1318 10,046 11.55
11,000 1299 10,331 11.88 1315 10,529 12.11 1332 10,745 12.36 1350 10,979 12.63 1370 11,232 12.92
11,500 1357 11,604 13.35 1372 11,806 13.58 — — — — — — — — —
12,000 ———————————————
12,500 ———————————————
581A300 (25 TONS) (Low Heat Units)* (cont)
Airflow
(Cfm)
External Static Pressure (in. wg)
1.2 1.4 1.6 1.8 2.0
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
6,500 988 3,900 4.49 1035 4,248 4.89 1082 4,632 5.33 1129 5,050 5.81 1177 5,499 6.32
7,000 1024 4,428 5.09 1066 4,760 5.48 1109 5,124 5.89 1153 5,521 6.35 1197 5,950 6.84
7,500 1063 5,031 5.79 1102 5,354 6.16 1141 5,703 6.56 1181 6,081 6.99 1221 6,487 7.46
8,000 1105 5,709 6.57 1140 6,025 6.93 1176 6,364 7.32 1213 6,729 7.74 1250 7,116 8.18
8,500 1149 6,465 7.44 1181 6,777 7.79 1215 7,109 8.18 1249 7,463 8.58 1283 7,838 9.02
9,000 1194 7,302 8.40 1225 7,608 8.75 1256 7,935 9.13 1287 8,282 9.53 1319 8,649 9.95
9,500 1242 8,222 9.46 1270 8,524 9.80 1298 8,847 10.17 1328 9,189 10.57 1358 9,548 10.98
10,000 1290 9,227 10.61 1316 9,525 10.96 1343 9,845 11.32 1370 10,181 11.71 1399 10,536 12.12
10,500 1340 10,321 11.87 1364 10,617 12.21 1389 10,932 12.57 — — — — — —
11,000 1391 11,505 13.23 — — — — — — — — — — — —
11,500 — — ——— ——— ——— —— — —
12,000 — — —— — ——— ——— —— — —
12,500 — — —— — ——— ——— —— — —
Bhp — Brake Horsepower Input to Fan
Watts — Input Watts to Motor