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NOTES:
• CFM information in the above table is with high velocity, permanent filter(s) as shipped with the furnace. If the furnace is shipped with two
side return filters, this table assumes both filters are used.
• 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 (Ht
g
. Tons AC External Static Pressure, Inches Water Column
Speed As Motor at .5" 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Shipped) Speed ESP CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFM
HIGH 3.0 1381 28 1319 29 1260 30 1197 32 1131 34 1055 960 847
GUD045X30B MED 2.5 1173 33 1142 34 1103 35 1055 36 998 38 931 848 736
(MED) LOW 2.0 908 42 901 43 884 43 855 45 815 47 760 688 602
HIGH 3.0 1458 41 1395 43 1334 45 1266 47 1188 50 1111 1015 895
GUD070X30B MED 2.5 1270 47 1229 49 1178 51 1122 53 1060 56 986 898 778
(HIGH) MED-LO 2.0 1019 59 1001 60 973 61 938 64 891 ----- 831 750 649
LOW 1.5 782 ----- 778 ----- 766 ----- 746 ----- 708 ----- 659 590 501
HIGH 4.0 1861 ----- 1803 ----- 1714 35 1647 37 1561 39 1457 1278 1063
GUD070X40B MED 3.5 1699 36 1643 37 1577 38 1512 40 1431 42 1312 1164 977
(MED-LOW) MED-LO 3.5 1519 40 1482 41 1439 42 1386 44 1316 46 1196 1063 903
LOW 3.0 1278 47 1277 47 1268 48 1227 49 1164 52 1069 937 839
HIGH 4.0 1664 47 1599 49 1532 51 1465 53 1395 56 1312 1234 1150
GUD090X35B MED 3.5 1465 53 1439 54 1395 56 1345 58 1288 60 1218 1145 1048
(MED) MED-LO 3.0 1089 71 1108 70 1106 70 1092 71 1059 73 1021 961 883
LOW 2.5 850 ----- 845 ----- 841 ----- 834 ----- 823 ----- 801 759 688
HIGH 5.0 2271 ----- 2184 36 2094 37 2000 39 1914 41 1810 1701 1552
GUD090X50B MED 4.5 1951 40 1889 41 1837 42 1770 44 1701 46 1598 1489 1353
(MED) MED-LO 4.0 1724 45 1695 46 1647 47 1598 49 1534 51 1412 1362 1236
LOW 3.5 1495 52 1474 53 1448 54 1407 55 1356 57 1289 1196 1036
HIGH 5.0 2358 42 2228 44 2094 47 1997 49 1896 52 1800 1680 1552
GUD115X50B MED 4.5 1922 52 1869 52 1810 55 1743 57 1688 59 1583 1488 1364
(HIGH) MED-LO 4.0 1699 58 1672 59 1630 61 1583 63 1526 65 1454 1369 1248
LOW 3.5 1475 ----- 1462 ----- 1441 ----- 1414 ----- 1369 ----- 1317 1232 1067