Heat units emitted per hour, per square foot of external surface, per degree of difference in temperature.

Vertical Tubes, Prime Surface Radiators

Difference in Temperature.

F°.

Tubes Massed.

Single Row Tubes.

Height,

40 Inches.

B. T. U.

Height,

24 Inches.

B. T. U.

Height,

40 Inches.

B. T. U.

Height,

24 Inches.

B. T. U.

50

1.29

1.54

1.46

2.01

60

1.33

1.58

1.50

2.06

70

1.36

1.62

1.54

2.12

80

1.39

1.66

1.58

2.17

90

1.41

1.70

1.62

2.22

100

1.46

1.74

1.65

2.27

110

1.49

1.78

1.69

2.32

120

1.52

1.82

1.73

2.38

130

1.56

1.86

1.77

2.43

140

1.59

1.90

1.81

2.48

150

1.63

1.94

1.85

2.53

160

1.66

1.98

1.88

2.59

170

1.69

2.02

1.92

2.64

180

1.73

2.06

1.96

2.70

190

1.76

2.10

2.00

2.75

200

1.80

2.14

2.03

2.80

210

1.83

2.18

2.07

2.85

220

1.86

2.22

2.11

2.90

230

1.90

2.27

2.15

2.96

240

1.93

2.31

2.19

3.01

Flue Radiators - Natural Draft

Radiating Surface.

B. T. U. Emitted.

Total B. T. U. Emitted.

Extended. Sq. Ft.

Plain. Sq. Ft.

Extended. Sq. Ft.

Plain.

Sq. Ft.

Extended.

Plain.

57.80

6.40

63.10

7.18

40.40 4.24

41.20 4.50

1.65 2.06

1.39 1.90

1.97 2.39 1.85 2.24

95.37 13.12 87.81 13.64

58 10.13

76.22 10.08