2
NOTES:
• All furnaces ship as high speed for cooling. Installer must adjust blower speed as needed.
• For most jobs, about 400 CFM per ton when cooling is desirable.
• This chart is for furnaces installed at 0 - 4000 feet. At higher altitudes, a properly derated unit will have the same temperature rise at a particular
CFM, while the ESP at that CFM will be lower.
• The shaded area ( )indicates ranges in excess of maximum external static pressure allowable when heating. For satisfactory operation,
external static pressure should not exceed 0.5” W.C. The data for 0.6” W.C. to 0.8” W.C. is shown for air conditioning purposes only.
• The dashed (-----) areas indicate a temperature rise not recommended for this model.
• The installation must be adjusted to obtain a temperature rise within the range listed on the furnace nameplate.
Model
External Static Pressure (Inches of Water Column)
Heating Speed
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
as Shipped
CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM
HIGH 3.0 1322 --- 1298 --- 1278 --- 1243 --- 1196 --- 1137 1074 1000
GUCA045AX30 MED-HI 2.5 1131 35 1114 35 1097 36 1068 37 1019 39 968 907 827
(MED-LO) MED-LO 2.0 903 44 896 44 876 45 844 47 807 49 764 706 652
LOW 1.5 702 56 680 58 657 60 624 63 584 --- 542 485 423
HIGH 3.5 1590 37 1550 38 1505 39 1454 41 1406 42 1343 1266 1194
GUCA070AX30 MED-HI 3.0 1489 40 1450 41 1415 42 1370 43 1324 45 1261 1205 1130
(MED-LO) MED-LO 2.5 1251 47 1226 48 1205 49 1173 50 1135 52 1096 1037 975
LOW 2.0 1001 59 988 60 969 61 956 62 929 64 902 859 807
HIGH 4.0 1861 --- 1823 --- 1778 --- 1721 --- 1643 36 1581 1500 1387
GUCA070AX40 MED-HI 3.5 1620 37 1597 37 1565 38 1516 39 1462 41 1410 1318 1235
(MED-LO) MED-LO 3.0 1387 43 1369 43 1313 45 1284 46 1224 48 1167 1095 1024
LOW 2.5 1193 50 1162 51 1118 53 1072 55 1012 59 961 894 836
HIGH 4.0 1821 43 1768 45 1699 46 1624 49 1544 51 1439 1354 1227
GUCA090AX40 MED-HI 3.5 1624 49 1561 51 1520 52 1461 54 1381 57 1297 1217 1109
(HIGH) MED-LO 3.0 1395 57 1363 58 1311 60 1258 63 1201 66 1120 1045 957
LOW 2.5 1212 65 1164 --- 1126 --- 1080 --- 1014 --- 957 882 815
HIGH 5.0 2375 --- 2323 --- 2282 35 2217 36 2128 37 2056 1956 1857
GUCA090AX50 MED-HI 4.5 1752 45 1741 45 1729 46 1682 47 1640 48 1591 1534 1454
(MED-HI) MED-LO 3.5 1504 53 1487 53 1469 54 1443 55 1412 56 1380 1318 1228
LOW 3.0 1274 62 1258 63 1253 63 1222 65 1201 --- 1147 1072 972
HIGH 5.0 2359 42 2298 43 2208 45 2117 47 2029 49 1914 1783 1678
GUCA115AX50 MED-HI 4.5 1849 53 1808 55 1757 56 1722 57 1651 60 1595 1507 1403
(HIGH) MED-LO 3.5 1575 63 1556 63 1527 65 1497 --- 1456 --- 1370 1290 1205
LOW 3.0 1370 --- 1348 --- 1313 --- 1278 --- 1254 --- 1180 1114 1029
GUCA Blower Performance
Motor
Speed
Tons AC
at 0.5"
ESP
(10 pages)
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