Appendix NA3 – Fan Motor Efficiencies

Table NA3-2 – Fan Motor Efficiencies (< 1 HP)

Nameplate or Brake Horsepower

Standard Fan Motor Efficiency

NEMA* High Efficiency

Premium Efficiency

1/20

40%

...

...

1/12

49%

...

...

1/8

55%

...

...

1/6

60%

...

...

1/4

64%

...

...

1/3

66%

...

...

1/2

70%

76.0%

80.0%

3/4

72%

77.0%

84.0%

NOTE: For default drive efficiencies, see  Nonresidential ACM Reference Manual

*NEMA - Proposed standard using test procedures.

Minimum NEMA efficiency as specified by test IEEE 112b Rating Method.

 

Table NA3-3 – Fan Motor Efficiencies (1 HP and over)

Motor Horsepower

Open Motors

Enclosed Motors

2 pole

3600 rpm

4 pole

1800 rpm

6 pole

1200 rpm

8 pole

900 rpm

2 pole

3600 rpm

4 pole

1800 rpm

6 pole

1200 rpm

8 pole

900 rpm

1

77.0

85.5

82.5

74.0

77.0

85.5

82.5

74.0

1.5

84.0

86.5

86.5

75.5

84.0

86.5

87.5

77.0

2

85.5

86.5

87.5

85.5

85.5

86.5

88.5

82.5

3

85.5

89.5

88.5

86.5

86.5

89.5

89.5

84.0

5

86.5

89.5

89.5

87.5

88.5

89.5

89.5

85.5

7.5

88.5

91.0

90.2

88.5

89.5

91.7

91.0

85.5

10

89.5

91.7

91.7

89.5

90.2

91.7

91.0

88.5

15

90.2

93.0

91.7

89.5

91.0

92.4

91.7

88.5

20

91.0

93.0

92.4

90.2

91.0

93.0

91.7

89.5

25

91.7

93.6

93.0

90.2

91.7

93.6

93.0

89.5

30

91.7

94.1

93.6

91.0

91.7

93.6

93.0

91.0

40

92.4

94.1

94.1

91.0

92.4

94.1

94.1

91.0

50

93.0

94.5

94.1

91.7

93.0

94.5

94.1

91.7

60

93.6

95.0

94.5

92.4

93.6

95.0

94.5

91.7

75

93.6

95.0

94.5

93.6

93.6

95.4

94.5

93.0

100

93.6

95.4

95.0

93.6

94.1

95.4

95.0

93.0

125

94.1

95.4

95.0

93.6

95.0

95.4

95.0

93.6

150

94.1

95.8

95.4

93.6

95.0

95.8

95.8

93.6

200

95.0

95.8

95.4

93.6

95.4

96.2

95.8

94.1

250

95.0

95.8

95.4

94.5

95.8

96.2

95.8

94.5

300

95.4

95.8

95.4

 

95.8

96.2

95.8

 

350

95.4

95.8

95.4

 

95.8

96.2

95.8

400

95.8

95.8

95.8

 

95.8

96.2

95.8

 

450

95.8

96.2

96.2

 

95.8

96.2

95.8

 

500

95.8

96.2

96.2

 

95.8

96.2

95.8