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PERFORMANCE DATA — 581C
LEGEND
*Motor drive range: 1075 to 1455 rpm. All other rpms require field-
supplied drive.
Refer to page 107 for general Fan Performance Data notes.
NOTES:
1. Boldface indicates field-supplied drive is required.
2. Maximum continuous bhp is 2.40.
FAN PERFORMANCE — VERTICAL DISCHARGE UNITS (cont)
LEGEND
*Motor drive range: 770 to 1185 rpm. All other rpms require field-
supplied drive.
Refer to page 107 for general Fan Performance Data 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 1016 0.51 505 1080 0.57 572 1139 0.64 637 1195 0.71 702 1249 0.77 765
1000 1041 0.59 587 1104 0.67 662 1163 0.74 737 1219 0.81 811 1272 0.89 883
1100 1066 0.68 674 1129 0.76 759 1188 0.85 843 1243 0.93 925 1296 1.01 1007
1200 1093 0.77 767 1155 0.87 861 1213 0.96 955 1268 1.05 1047 1321 1.14 1137
1300 1119 0.87 866 1181 0.98 970 1239 1.08 1073 1294 1.18 1175 1346 1.28 1275
1400 1147 0.98 972 1208 1.09 1086 1265 1.21 1199 1320 1.32 1310 1371 1.43 1419
1500 1175 1.09 1086 1235 1.22 1209 1292 1.34 1332 1346 1.46 1452 1397 1.58 1572
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 666 0.26 257 778 0.37 367 871 0.47 471 952 0.57 572 1025 0.67 670
1300 701 0.31 306 810 0.43 426 901 0.54 540 981 0.65 651 1053 0.76 760
1400 737 0.36 361 842 0.49 491 931 0.62 616 1010 0.74 738 1081 0.86 856
1500 773 0.42 422 875 0.57 564 963 0.70 699 1040 0.84 831 1110 0.96 960
1600 810 0.49 491 909 0.65 643 994 0.79 790 1070 0.94 932 1140 1.08 1070
1700 847 0.57 567 943 0.73 730 1027 0.89 888 1101 1.05 1040 1170 1.20 1189
1800 885 0.66 652 978 0.83 826 1060 1.00 994 1133 1.16 1157 — — —
1900 923 0.75 745 1014 0.94 930 1093 1.11 1109 ——————
2000 962 0.85 847 1049 1.05 1043 —————————
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 1093 0.77 767 1155 0.87 861 1213 0.96 955 1268 1.05 1047 1321 1.14 1137
1300 1119 0.87 866 1181 0.98 970 1239 1.08 1073 1294 1.18 1175 ———
1400 1147 0.98 972 1208 1.09 1086 —————————
1500 1175 1.09 1086 — — — —————————
1600 ———————————————
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 666 0.26 257 778 0.37 367 871 0.47 471 952 0.57 572 1025 0.67 670
1300 701 0.31 306 810 0.43 426 901 0.54 540 981 0.65 651 1053 0.76 760
1400 737 0.36 361 842 0.49 491 931 0.62 616 1010 0.74 738 1081 0.86 856
1500 773 0.42 422 875 0.57 564 963 0.70 699 1040 0.84 831 1110 0.96 960
1600 810 0.49 491 909 0.65 643 994 0.79 790 1070 0.94 932 1140 1.08 1070
1700 847 0.57 567 943 0.73 730 1027 0.89 888 1101 1.05 1040 1170 1.20 1189
1800 885 0.66 652 978 0.83 826 1060 1.00 994 1133 1.16 1157 1200 1.32 1316
1900 923 0.75 745 1014 0.94 930 1093 1.11 1109 1165 1.29 1283 1231 1.46 1453
2000 962 0.85 847 1049 1.05 1043 1127 1.24 1233 1198 1.42 1417 1263 1.61 1598
581C024-060