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PERFORMANCE DATA — 581C
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS
LEGEND
*Motor drive range: 680 to 1044 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.
FAN PERFORMANCE — HORIZONTAL DISCHARGE UNITS
LEGEND
*Motor drive range: 680 to 1044 rpm. All other rpms require field- sup-
plied 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.
581C024 (2Tons)
AIRFLOW
(Cfm)
EXTERNALSTATIC PRESSURE (in. wg)
0.1 0.2 0.4 0.6 0.8 1.0
Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp Rpm Bhp
600 490 0.08 521 0.08 597 0.14 703 0.21 788 0.29 868 0.37
700 519 0.09 557 0.09 623 0.16 729 0.24 816 0.32 892 0.41
800 537 0.1 582 0.12 650 0.19 751 0.27 845 0.37 927 0.47
900 560 0.13 610 0.14 681 0.22 783 0.32 870 0.42 947 0.53
1000 589 0.15 640 0.16 707 0.26 808 0.36 894 0.47 971 0.58
Bhp — Brake Horsepower
Watts — Input Watts to Motor
581C036 (3 TONS) — STANDARD MOTOR (BELT DRIVE)*
Airflow
(Cfm)
External Static Pressure (in. wg)
0.20.40.60.81.0
Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts
900 553 0.14 134 681 0.22 221 782 0.32 316 870 0.42 417 948 0.53 526
1000 582 0.16 163 707 0.26 257 807 0.36 358 894 0.47 466 971 0.58 580
1100 612 0.20 196 734 0.30 297 833 0.41 405 919 0.52 519 995 0.64 639
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
581C036 (3 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
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 ———
1100 1065 0.77 765 1130 0.90 896 1190 1.04 1032 1247 1.18 1173 ———
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 ————————————
Bhp — Brake Horsepower
Watts — Input Watts to Motor
581C036 (3 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
900 553 0.14 134 681 0.22 221 782 0.32 316 870 0.42 417 948 0.53 526
1000 582 0.16 163 707 0.26 257 807 0.36 358 894 0.47 466 971 0.58 580
1100 612 0.20 196 734 0.30 297 833 0.41 405 919 0.52 519 995 0.64 639
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