Direct Radiation. Fall of Temperature, 20°. Height of from 10 to 15 feet.

Diameter of

Mains. Inches.

Total Estimated Length of Circuit in Lineal Feet

100 Sq. Ft.

200 Sq. Ft.

300

Sq. Ft.

400 3q. Ft.

500

Sq.ft.

600 sqFt.

700 sqFt.

800 Sq. Ft.

900 Sq.ft

1,000 sq ft

1

20

1 1/4

35

20

1 1/2

56

40

25

2

116

85

70

50

2 1/2

220

150

120

100

90

3

345

240

200

170

150

140

125

110

100

90

3 1/2

500

340

280

245

225

205

190

175

162

150

4

700

485

390

340

310

280

260

240

230

4 1/2

925

640

535

460

410

375

345

325

800

5

1,200

830

700

600

540

490

450

400

6

1,900

1,325

1,100

950

850

775

700

650

620

600

7

2,000

1,600

1,400

1,250

1,140

1,050

975

925

8

1,970

1,720

1,550

1,440

1,350

1,300

9

1,900

1,800

1,700

1,620