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PERFORMANCE DATA — 581C
LEGEND *Motor drive range: 1075 to 1455 rpm. All other rpms require field-
supplied drive.
See page 107 for general fan performance notes.
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS (cont)
LEGEND
*Motor drive range: 770 to 1185 rpm. All other rpms require field-
supplied drive.
See page 107 for general fan performance notes.
NOTES:
1. Boldface indicates field-supplied drive is required.
2. Maximum continuous bhp is 1.20.
581C036 (3 TONS) — HIGH-STATIC MOTOR (BELT DRIVE)* (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
900 1019 0.64 640 1084 0.76 760 1146 0.89 885 1203 1.02 1016 1258 1.16 1152
1000 1042 0.70 700 1107 0.83 825 1168 0.96 956 1225 1.10 1091 1279 1.24 1232
1100 1065 0.77 765 1130 0.90 896 1190 1.04 1032 1247 1.18 1173 1301 1.33 1319
1200 1089 0.84 837 1153 0.98 974 1213 1.12 1115 1270 1.27 1262 1324 1.42 1413
1300 1113 0.92 915 1177 1.06 1058 1237 1.21 1205 1293 1.36 1358 1347 1.52 1514
1400 1138 1.01 1000 1201 1.15 1149 1261 1.31 1303 1317 1.47 1461 1370 1.63 1623
1500 1163 1.10 1092 1226 1.25 1247 1285 1.41 1407 1341 1.58 1571 1394 1.75 1740
Bhp — Brake Horsepower
Watts — Input Watts to Motor
581C048 (4 TONS) — STANDARD MOTOR (BELT DRIVE)*
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
1200 643 0.23 234 762 0.34 343 859 0.46 458 944 0.58 579 1020 0.71 705
1300 675 0.28 277 790 0.40 394 886 0.52 517 969 0.65 644 1044 0.78 777
1400 707 0.33 326 819 0.45 452 913 0.58 581 996 0.72 716 1070 0.86 855
1500 740 0.38 382 849 0.52 515 941 0.66 653 1023 0.80 795 1096 0.95 941
1600 773 0.45 444 879 0.59 586 970 0.73 731 1050 0.88 880 1123 1.04 1034
1700 807 0.52 513 910 0.67 663 999 0.82 817 1078 0.98 973 1150 1.14 1134
1800 841 0.59 589 942 0.75 749 1029 0.91 910 1106 1.08 1074 — — —
1900 875 0.68 674 974 0.85 842 1059 1.02 1012 1135 1.19 1184 — — —
2000 910 0.77 767 1006 0.95 944 1090 1.13 1122 ——————
581C048 (4 TONS) — STANDARD MOTOR (BELT DRIVE)* (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
1200 1089 0.84 837 1153 0.98 974 1213 1.12 1115 ——————
1300 1113 0.92 915 1177 1.06 1058 —————————
1400 1138 1.01 1000 1201 1.15 1149 —————————
1500 1163 1.10 1092 — — — —————————
1600 1189 1.20 1191 ————————————
1700 ———————————————
1800 ———————————————
1900 ———————————————
2000 ———————————————
Bhp — Brake Horsepower
Watts — Input Watts to Motor
581C048 (4 TONS) — HIGH-STATIC MOTOR (BELT DRIVE)*
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
1200 643 0.23 234 762 0.34 343 859 0.46 458 944 0.58 579 1020 0.71 705
1300 675 0.28 277 790 0.40 394 886 0.52 517 969 0.65 644 1044 0.78 777
1400 707 0.33 326 819 0.45 452 913 0.58 581 996 0.72 716 1070 0.86 855
1500 740 0.38 382 849 0.52 515 941 0.66 653 1023 0.80 795 1096 0.95 941
1600 773 0.45 444 879 0.59 586 970 0.73 731 1050 0.88 880 1123 1.04 1034
1700 807 0.52 513 910 0.67 663 999 0.82 817 1078 0.98 973 1150 1.14 1134
1800 841 0.59 589 942 0.75 749 1029 0.91 910 1106 1.08 1074 1177 1.25 1242
1900 875 0.68 674 974 0.85 842 1059 1.02 1012 1135 1.19 1184 1205 1.37 1360
2000 910 0.77 767 1006 0.95 944 1090 1.13 1122 1165 1.31 1302 1234 1.49 1485
581C024-060