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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 (Htg.

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

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